No results when searching for strings with apostrophe

I use Sphinx 2.2.11 and SMF. In standard form-based search I get results for words with apostrophe, for example searching for “you’ve” (although, these matches do not get highlighted).

However, when the search is passed via a URL parameter like these examples:
https://www.translatum.gr/forum/index.php?action=search2;search=%22you%27ve%22 https://www.translatum.gr/forum/index.php?action=search2;search=you%27ve

I get no results at all. Switching search method from Sphinx to native SMF, does produce results in this case. This is my config (paths removed):

index smf_base_index
{
index_exact_words = 1
expand_keywords   = 1
min_infix_len     = 2
html_strip 		  = 1
index_field_lengths = 1
min_word_len 	  = 2
ngram_len         = 1
ngram_chars     = U+4E00..U+9FBB, U+3400..U+4DB5, U+20000..U+2A6D6, U+FA0E, U+FA0F, U+FA11, U+FA13, U+FA14, U+FA1F, \
U+FA21, U+FA23, U+FA24, U+FA27, U+FA28, U+FA29, U+3105..U+312C, U+31A0..U+31B7, U+3041, U+3043, U+3045, U+3047, \
U+3049, U+304B, U+304D, U+304F, U+3051, U+3053, U+3055, U+3057, U+3059, U+305B, U+305D, U+305F, U+3061, U+3063, \
U+3066, U+3068, U+306A..U+306F, U+3072, U+3075, U+3078, U+307B, U+307E..U+3083, U+3085, U+3087, U+3089..U+308E, \
U+3090..U+3093, U+30A1, U+30A3, U+30A5, U+30A7, U+30A9, U+30AD, U+30AF, U+30B3, U+30B5, U+30BB, U+30BD, U+30BF, \
U+30C1, U+30C3, U+30C4, U+30C6, U+30CA, U+30CB, U+30CD, U+30CE, U+30DE, U+30DF, U+30E1, U+30E2, U+30E3, U+30E5, \
U+30E7, U+30EE, U+30F0..U+30F3, U+30F5, U+30F6, U+31F0, U+31F1, U+31F2, U+31F3, U+31F4, U+31F5, U+31F6, U+31F7, \
U+31F8, U+31F9, U+31FA, U+31FB, U+31FC, U+31FD, U+31FE, U+31FF, U+AC00..U+D7A3, U+1100..U+1159, U+1161..U+11A2, \
U+11A8..U+11F9, U+A000..U+A48C, U+A492..U+A4C6
charset_table = U+21..U+60, U+7b..U+7e, U+a0..U+bf, U+c6, U+d0, U+d7..U+d8, U+de, U+f7, U+110, U+126, U+132, U+138, \
U+13f, U+141, U+149..U+14a, U+152, U+166, U+180..U+182, U+184, U+186..U+187, U+189..U+18b, U+18d..U+191, \
U+193..U+198, U+19a..U+19f, U+1a2, U+1a4, U+1a6..U+1a7, U+1a9..U+1ac, U+1ae, U+1b1..U+1b3, U+1b5, U+1b7..U+1b8, \
U+1ba..U+1bc, U+1be..U+1c4, U+1c7, U+1ca, U+1e4, U+1f1, U+21c, U+220..U+222, U+224, U+234..U+252, U+255, U+258, \
U+25a, U+25c..U+25f, U+261..U+262, U+264..U+267, U+26a..U+26e, U+270..U+271, U+273..U+274, U+276..U+27f, \
U+281..U+282, U+284..U+287, U+289, U+28c..U+291, U+293..U+2af, U+370..U+38f, U+392..U+394, U+396, U+398, \
U+39a..U+39b, U+39d..U+39e, U+3a0..U+3a4, U+3a6..U+3a8, U+3cf, U+3d2, U+3d7..U+3da, U+3dc, U+3de, U+3e0, U+3e2, \
U+3e4, U+3e6, U+3e8, U+3ea, U+3ec, U+3ee, U+3f3..U+400, U+402..U+406, U+408..U+412, U+414, U+416..U+417, U+419, \
U+41b..U+422, U+424..U+42f, U+460, U+462, U+464, U+466, U+468, U+46a, U+46c, U+46e, U+470, U+472, U+474, U+478, \
U+47a, U+47c, U+47e, U+480, U+482..U+48c, U+48e, U+490, U+492, U+494, U+496, U+498, U+49a, U+49c, U+49e, U+4a0, \
U+4a2, U+4a4, U+4a6, U+4a8, U+4aa, U+4ac, U+4ae, U+4b0, U+4b2, U+4b4, U+4b6, U+4b8, U+4ba, U+4bc, U+4be, U+4c0, \
U+4c3, U+4c5..U+4c7, U+4c9..U+4cb, U+4cd..U+4cf, U+4d4, U+4d8, U+4e0, U+4e8, U+4f6..U+4f7, U+4fa..U+560, \
U+587..U+58f, U+10a0..U+10ff, U+1d00..U+1dff, U+1e9a, U+1e9c..U+1e9f, U+1efa..U+1eff, U+1f16..U+1f17, \
U+1f1e..U+1f1f, U+1f46..U+1f47, U+1f4e..U+1f4f, U+1f58, U+1f5a, U+1f5c, U+1f5e, U+1f71, U+1f73, U+1f75, U+1f77, \
U+1f79, U+1f7b, U+1f7d..U+1f7f, U+1fb5, U+1fbd, U+1fbf..U+1fc1, U+1fc5, U+1fcd..U+1fcf, U+1fd3..U+1fd5, \
U+1fdc..U+1fdf, U+1fe3, U+1fed..U+1ff1, U+1ff5, U+1ffd..U+1fff, U+2460..U+24cf, U+24ea..U+24ff, U+2c60..U+2c7f, \
U+2d00..U+2d2f, U+a4d0..U+a4f0, U+a720..U+a7f0, U+ff00..U+ff40, U+ff5b..U+2ffff, U+61->U+41, U+c0->U+41, \
U+c1->U+41, U+c2->U+41, U+c3->U+41, U+c4->U+41, U+c5->U+41, U+e0->U+41, U+e1->U+41, U+e2->U+41, U+e3->U+41, \
U+e4->U+41, U+e5->U+41, U+100->U+41, U+101->U+41, U+102->U+41, U+103->U+41, U+104->U+41, U+105->U+41, \
U+1cd->U+41, U+1ce->U+41, U+1de->U+41, U+1df->U+41, U+1e0->U+41, U+1e1->U+41, U+1fa->U+41, U+1fb->U+41, \
U+200->U+41, U+201->U+41, U+202->U+41, U+203->U+41, U+226->U+41, U+227->U+41, U+1e00->U+41, U+1e01->U+41, \
U+1ea0->U+41, U+1ea1->U+41, U+1ea2->U+41, U+1ea3->U+41, U+1ea4->U+41, U+1ea5->U+41, U+1ea6->U+41, U+1ea7->U+41, \
U+1ea8->U+41, U+1ea9->U+41, U+1eaa->U+41, U+1eab->U+41, U+1eac->U+41, U+1ead->U+41, U+1eae->U+41, U+1eaf->U+41, \
U+1eb0->U+41, U+1eb1->U+41, U+1eb2->U+41, U+1eb3->U+41, U+1eb4->U+41, U+1eb5->U+41, U+1eb6->U+41, U+1eb7->U+41, \
U+62->U+42, U+1e02->U+42, U+1e03->U+42, U+1e04->U+42, U+1e05->U+42, U+1e06->U+42, U+1e07->U+42, U+63->U+43, \
U+c7->U+43, U+e7->U+43, U+106->U+43, U+107->U+43, U+108->U+43, U+109->U+43, U+10a->U+43, U+10b->U+43, \
U+10c->U+43, U+10d->U+43, U+1e08->U+43, U+1e09->U+43, U+64->U+44, U+10e->U+44, U+10f->U+44, U+1e0a->U+44, \
U+1e0b->U+44, U+1e0c->U+44, U+1e0d->U+44, U+1e0e->U+44, U+1e0f->U+44, U+1e10->U+44, U+1e11->U+44, U+1e12->U+44, \
U+1e13->U+44, U+65->U+45, U+c8->U+45, U+c9->U+45, U+ca->U+45, U+cb->U+45, U+e8->U+45, U+e9->U+45, U+ea->U+45, \
U+eb->U+45, U+112->U+45, U+113->U+45, U+114->U+45, U+115->U+45, U+116->U+45, U+117->U+45, U+118->U+45, \
U+119->U+45, U+11a->U+45, U+11b->U+45, U+204->U+45, U+205->U+45, U+206->U+45, U+207->U+45, U+228->U+45, \
U+229->U+45, U+1e14->U+45, U+1e15->U+45, U+1e16->U+45, U+1e17->U+45, U+1e18->U+45, U+1e19->U+45, U+1e1a->U+45, \
U+1e1b->U+45, U+1e1c->U+45, U+1e1d->U+45, U+1eb8->U+45, U+1eb9->U+45, U+1eba->U+45, U+1ebb->U+45, U+1ebc->U+45, \
U+1ebd->U+45, U+1ebe->U+45, U+1ebf->U+45, U+1ec0->U+45, U+1ec1->U+45, U+1ec2->U+45, U+1ec3->U+45, U+1ec4->U+45, \
U+1ec5->U+45, U+1ec6->U+45, U+1ec7->U+45, U+66->U+46, U+1e1e->U+46, U+1e1f->U+46, U+67->U+47, U+11c->U+47, \
U+11d->U+47, U+11e->U+47, U+11f->U+47, U+120->U+47, U+121->U+47, U+122->U+47, U+123->U+47, U+1e6->U+47, \
U+1e7->U+47, U+1f4->U+47, U+1f5->U+47, U+1e20->U+47, U+1e21->U+47, U+68->U+48, U+124->U+48, U+125->U+48, \
U+21e->U+48, U+21f->U+48, U+1e22->U+48, U+1e23->U+48, U+1e24->U+48, U+1e25->U+48, U+1e26->U+48, U+1e27->U+48, \
U+1e28->U+48, U+1e29->U+48, U+1e2a->U+48, U+1e2b->U+48, U+1e96->U+48, U+69->U+49, U+cc->U+49, U+cd->U+49, \
U+ce->U+49, U+cf->U+49, U+ec->U+49, U+ed->U+49, U+ee->U+49, U+ef->U+49, U+128->U+49, U+129->U+49, U+12a->U+49, \
U+12b->U+49, U+12c->U+49, U+12d->U+49, U+12e->U+49, U+12f->U+49, U+130->U+49, U+131->U+49, U+1cf->U+49, \
U+1d0->U+49, U+208->U+49, U+209->U+49, U+20a->U+49, U+20b->U+49, U+1e2c->U+49, U+1e2d->U+49, U+1e2e->U+49, \
U+1e2f->U+49, U+1ec8->U+49, U+1ec9->U+49, U+1eca->U+49, U+1ecb->U+49, U+6a->U+4a, U+134->U+4a, U+135->U+4a, \
U+1f0->U+4a, U+6b->U+4b, U+136->U+4b, U+137->U+4b, U+1e8->U+4b, U+1e9->U+4b, U+1e30->U+4b, U+1e31->U+4b, \
U+1e32->U+4b, U+1e33->U+4b, U+1e34->U+4b, U+1e35->U+4b, U+6c->U+4c, U+139->U+4c, U+13a->U+4c, U+13b->U+4c, \
U+13c->U+4c, U+13d->U+4c, U+13e->U+4c, U+1e36->U+4c, U+1e37->U+4c, U+1e38->U+4c, U+1e39->U+4c, U+1e3a->U+4c, \
U+1e3b->U+4c, U+1e3c->U+4c, U+1e3d->U+4c, U+6d->U+4d, U+1e3e->U+4d, U+1e3f->U+4d, U+1e40->U+4d, U+1e41->U+4d, \
U+1e42->U+4d, U+1e43->U+4d, U+6e->U+4e, U+d1->U+4e, U+f1->U+4e, U+143->U+4e, U+144->U+4e, U+145->U+4e, \
U+146->U+4e, U+147->U+4e, U+148->U+4e, U+1f8->U+4e, U+1f9->U+4e, U+1e44->U+4e, U+1e45->U+4e, U+1e46->U+4e, \
U+1e47->U+4e, U+1e48->U+4e, U+1e49->U+4e, U+1e4a->U+4e, U+1e4b->U+4e, U+6f->U+4f, U+d2->U+4f, U+d3->U+4f, \
U+d4->U+4f, U+d5->U+4f, U+d6->U+4f, U+f2->U+4f, U+f3->U+4f, U+f4->U+4f, U+f5->U+4f, U+f6->U+4f, U+14c->U+4f, \
U+14d->U+4f, U+14e->U+4f, U+14f->U+4f, U+150->U+4f, U+151->U+4f, U+1a0->U+4f, U+1a1->U+4f, U+1d1->U+4f, \
U+1d2->U+4f, U+1ea->U+4f, U+1eb->U+4f, U+1ec->U+4f, U+1ed->U+4f, U+20c->U+4f, U+20d->U+4f, U+20e->U+4f, \
U+20f->U+4f, U+22a->U+4f, U+22b->U+4f, U+22c->U+4f, U+22d->U+4f, U+22e->U+4f, U+22f->U+4f, U+230->U+4f, \
U+231->U+4f, U+1e4c->U+4f, U+1e4d->U+4f, U+1e4e->U+4f, U+1e4f->U+4f, U+1e50->U+4f, U+1e51->U+4f, U+1e52->U+4f, \
U+1e53->U+4f, U+1ecc->U+4f, U+1ecd->U+4f, U+1ece->U+4f, U+1ecf->U+4f, U+1ed0->U+4f, U+1ed1->U+4f, U+1ed2->U+4f, \
U+1ed3->U+4f, U+1ed4->U+4f, U+1ed5->U+4f, U+1ed6->U+4f, U+1ed7->U+4f, U+1ed8->U+4f, U+1ed9->U+4f, U+1eda->U+4f, \
U+1edb->U+4f, U+1edc->U+4f, U+1edd->U+4f, U+1ede->U+4f, U+1edf->U+4f, U+1ee0->U+4f, U+1ee1->U+4f, U+1ee2->U+4f, \
U+1ee3->U+4f, U+70->U+50, U+1e54->U+50, U+1e55->U+50, U+1e56->U+50, U+1e57->U+50, U+71->U+51, U+72->U+52, \
U+154->U+52, U+155->U+52, U+156->U+52, U+157->U+52, U+158->U+52, U+159->U+52, U+210->U+52, U+211->U+52, \
U+212->U+52, U+213->U+52, U+1e58->U+52, U+1e59->U+52, U+1e5a->U+52, U+1e5b->U+52, U+1e5c->U+52, U+1e5d->U+52, \
U+1e5e->U+52, U+1e5f->U+52, U+73->U+53, U+df->U+53, U+15a->U+53, U+15b->U+53, U+15c->U+53, U+15d->U+53, \
U+15e->U+53, U+15f->U+53, U+160->U+53, U+161->U+53, U+17f->U+53, U+218->U+53, U+219->U+53, U+1e60->U+53, \
U+1e61->U+53, U+1e62->U+53, U+1e63->U+53, U+1e64->U+53, U+1e65->U+53, U+1e66->U+53, U+1e67->U+53, U+1e68->U+53, \
U+1e69->U+53, U+1e9b->U+53, U+74->U+54, U+162->U+54, U+163->U+54, U+164->U+54, U+165->U+54, U+21a->U+54, \
U+21b->U+54, U+1e6a->U+54, U+1e6b->U+54, U+1e6c->U+54, U+1e6d->U+54, U+1e6e->U+54, U+1e6f->U+54, U+1e70->U+54, \
U+1e71->U+54, U+1e97->U+54, U+75->U+55, U+d9->U+55, U+da->U+55, U+db->U+55, U+dc->U+55, U+f9->U+55, U+fa->U+55, \
U+fb->U+55, U+fc->U+55, U+168->U+55, U+169->U+55, U+16a->U+55, U+16b->U+55, U+16c->U+55, U+16d->U+55, \
U+16e->U+55, U+16f->U+55, U+170->U+55, U+171->U+55, U+172->U+55, U+173->U+55, U+1af->U+55, U+1b0->U+55, \
U+1d3->U+55, U+1d4->U+55, U+1d5->U+55, U+1d6->U+55, U+1d7->U+55, U+1d8->U+55, U+1d9->U+55, U+1da->U+55, \
U+1db->U+55, U+1dc->U+55, U+214->U+55, U+215->U+55, U+216->U+55, U+217->U+55, U+1e72->U+55, U+1e73->U+55, \
U+1e74->U+55, U+1e75->U+55, U+1e76->U+55, U+1e77->U+55, U+1e78->U+55, U+1e79->U+55, U+1e7a->U+55, U+1e7b->U+55, \
U+1ee4->U+55, U+1ee5->U+55, U+1ee6->U+55, U+1ee7->U+55, U+1ee8->U+55, U+1ee9->U+55, U+1eea->U+55, U+1eeb->U+55, \
U+1eec->U+55, U+1eed->U+55, U+1eee->U+55, U+1eef->U+55, U+1ef0->U+55, U+1ef1->U+55, U+76->U+56, U+1e7c->U+56, \
U+1e7d->U+56, U+1e7e->U+56, U+1e7f->U+56, U+77->U+57, U+174->U+57, U+175->U+57, U+1e80->U+57, U+1e81->U+57, \
U+1e82->U+57, U+1e83->U+57, U+1e84->U+57, U+1e85->U+57, U+1e86->U+57, U+1e87->U+57, U+1e88->U+57, U+1e89->U+57, \
U+1e98->U+57, U+78->U+58, U+1e8a->U+58, U+1e8b->U+58, U+1e8c->U+58, U+1e8d->U+58, U+79->U+59, U+dd->U+59, \
U+fd->U+59, U+ff->U+59, U+176->U+59, U+177->U+59, U+178->U+59, U+232->U+59, U+233->U+59, U+1e8e->U+59, \
U+1e8f->U+59, U+1e99->U+59, U+1ef2->U+59, U+1ef3->U+59, U+1ef4->U+59, U+1ef5->U+59, U+1ef6->U+59, U+1ef7->U+59, \
U+1ef8->U+59, U+1ef9->U+59, U+7a->U+5a, U+179->U+5a, U+17a->U+5a, U+17b->U+5a, U+17c->U+5a, U+17d->U+5a, \
U+17e->U+5a, U+1e90->U+5a, U+1e91->U+5a, U+1e92->U+5a, U+1e93->U+5a, U+1e94->U+5a, U+1e95->U+5a, U+e6->U+c6, \
U+1e2->U+c6, U+1e3->U+c6, U+1fc->U+c6, U+1fd->U+c6, U+f0->U+d0, U+f8->U+d8, U+1fe->U+d8, U+1ff->U+d8, \
U+fe->U+de, U+111->U+110, U+127->U+126, U+133->U+132, U+140->U+13f, U+142->U+141, U+14b->U+14a, U+153->U+152, \
U+167->U+166, U+253->U+181, U+183->U+182, U+185->U+184, U+254->U+186, U+188->U+187, U+256->U+189, U+257->U+18a, \
U+18c->U+18b, U+1dd->U+18e, U+259->U+18f, U+25b->U+190, U+192->U+191, U+260->U+193, U+263->U+194, U+269->U+196, \
U+268->U+197, U+199->U+198, U+26f->U+19c, U+272->U+19d, U+275->U+19f, U+1a3->U+1a2, U+1a5->U+1a4, U+280->U+1a6, \
U+1a8->U+1a7, U+283->U+1a9, U+1ad->U+1ac, U+288->U+1ae, U+28a->U+1b1, U+28b->U+1b2, U+1b4->U+1b3, U+1b6->U+1b5, \
U+1ee->U+1b7, U+1ef->U+1b7, U+292->U+1b7, U+1b9->U+1b8, U+1bd->U+1bc, U+1c5->U+1c4, U+1c6->U+1c4, U+1c8->U+1c7, \
U+1c9->U+1c7, U+1cb->U+1ca, U+1cc->U+1ca, U+1e5->U+1e4, U+1f2->U+1f1, U+1f3->U+1f1, U+1f6->U+195, U+1f7->U+1bf, \
U+21d->U+21c, U+223->U+222, U+225->U+224, U+391->U+386, U+3ac->U+386, U+3b1->U+386, U+1f00->U+386, \
U+1f01->U+386, U+1f02->U+386, U+1f03->U+386, U+1f04->U+386, U+1f05->U+386, U+1f06->U+386, U+1f07->U+386, \
U+1f08->U+386, U+1f09->U+386, U+1f0a->U+386, U+1f0b->U+386, U+1f0c->U+386, U+1f0d->U+386, U+1f0e->U+386, \
U+1f0f->U+386, U+1f70->U+386, U+1f80->U+386, U+1f81->U+386, U+1f82->U+386, U+1f83->U+386, U+1f84->U+386, \
U+1f85->U+386, U+1f86->U+386, U+1f87->U+386, U+1f88->U+386, U+1f89->U+386, U+1f8a->U+386, U+1f8b->U+386, \
U+1f8c->U+386, U+1f8d->U+386, U+1f8e->U+386, U+1f8f->U+386, U+1fb0->U+386, U+1fb1->U+386, U+1fb2->U+386, \
U+1fb3->U+386, U+1fb4->U+386, U+1fb6->U+386, U+1fb7->U+386, U+1fb8->U+386, U+1fb9->U+386, U+1fba->U+386, \
U+1fbc->U+386, U+3b2->U+392, U+3d0->U+392, U+3b3->U+393, U+3b4->U+394, U+395->U+388, U+3ad->U+388, \
U+3b5->U+388, U+1f10->U+388, U+1f11->U+388, U+1f12->U+388, U+1f13->U+388, U+1f14->U+388, U+1f15->U+388, \
U+1f18->U+388, U+1f19->U+388, U+1f1a->U+388, U+1f1b->U+388, U+1f1c->U+388, U+1f1d->U+388, U+1f72->U+388, \
U+1fc8->U+388, U+3b6->U+396, U+397->U+389, U+3ae->U+389, U+3b7->U+389, U+1f20->U+389, U+1f21->U+389, \
U+1f22->U+389, U+1f23->U+389, U+1f24->U+389, U+1f25->U+389, U+1f26->U+389, U+1f27->U+389, U+1f28->U+389, \
U+1f29->U+389, U+1f2a->U+389, U+1f2b->U+389, U+1f2c->U+389, U+1f2d->U+389, U+1f2e->U+389, U+1f2f->U+389, \
U+1f74->U+389, U+1f90->U+389, U+1f91->U+389, U+1f92->U+389, U+1f93->U+389, U+1f94->U+389, U+1f95->U+389, \
U+1f96->U+389, U+1f97->U+389, U+1f98->U+389, U+1f99->U+389, U+1f9a->U+389, U+1f9b->U+389, U+1f9c->U+389, \
U+1f9d->U+389, U+1f9e->U+389, U+1f9f->U+389, U+1fc2->U+389, U+1fc3->U+389, U+1fc4->U+389, U+1fc6->U+389, \
U+1fc7->U+389, U+1fca->U+389, U+1fcc->U+389, U+3b8->U+398, U+3d1->U+398, U+390->U+38a, U+399->U+38a, \
U+3aa->U+38a, U+3af->U+38a, U+3b9->U+38a, U+3ca->U+38a, U+1f30->U+38a, U+1f31->U+38a, U+1f32->U+38a, \
U+1f33->U+38a, U+1f34->U+38a, U+1f35->U+38a, U+1f36->U+38a, U+1f37->U+38a, U+1f38->U+38a, U+1f39->U+38a, \
U+1f3a->U+38a, U+1f3b->U+38a, U+1f3c->U+38a, U+1f3d->U+38a, U+1f3e->U+38a, U+1f3f->U+38a, U+1f76->U+38a, \
U+1fbe->U+38a, U+1fd0->U+38a, U+1fd1->U+38a, U+1fd2->U+38a, U+1fd6->U+38a, U+1fd7->U+38a, U+1fd8->U+38a, \
U+1fd9->U+38a, U+1fda->U+38a, U+3ba->U+39a, U+3f0->U+39a, U+3bb->U+39b, U+39c->U+b5, U+3bc->U+b5, U+3bd->U+39d, \
U+3be->U+39e, U+39f->U+38c, U+3bf->U+38c, U+3cc->U+38c, U+1f40->U+38c, U+1f41->U+38c, U+1f42->U+38c, \
U+1f43->U+38c, U+1f44->U+38c, U+1f45->U+38c, U+1f48->U+38c, U+1f49->U+38c, U+1f4a->U+38c, U+1f4b->U+38c, \
U+1f4c->U+38c, U+1f4d->U+38c, U+1f78->U+38c, U+1ff8->U+38c, U+3c0->U+3a0, U+3d6->U+3a0, U+3c1->U+3a1, \
U+3f1->U+3a1, U+1fe4->U+3a1, U+1fe5->U+3a1, U+1fec->U+3a1, U+3c2->U+3a3, U+3c3->U+3a3, U+3f2->U+3a3, \
U+3c4->U+3a4, U+3a5->U+38e, U+3ab->U+38e, U+3b0->U+38e, U+3c5->U+38e, U+3cb->U+38e, U+3cd->U+38e, \
U+1f50->U+38e, U+1f51->U+38e, U+1f52->U+38e, U+1f53->U+38e, U+1f54->U+38e, U+1f55->U+38e, U+1f56->U+38e, \
U+1f57->U+38e, U+1f59->U+38e, U+1f5b->U+38e, U+1f5d->U+38e, U+1f5f->U+38e, U+1f7a->U+38e, U+1fe0->U+38e, \
U+1fe1->U+38e, U+1fe2->U+38e, U+1fe6->U+38e, U+1fe7->U+38e, U+1fe8->U+38e, U+1fe9->U+38e, U+1fea->U+38e, \
U+3c6->U+3a6, U+3d5->U+3a6, U+3c7->U+3a7, U+3c8->U+3a8, U+3a9->U+38f, U+3c9->U+38f, U+3ce->U+38f, \
U+1f60->U+38f, U+1f61->U+38f, U+1f62->U+38f, U+1f63->U+38f, U+1f64->U+38f, U+1f65->U+38f, U+1f66->U+38f, \
U+1f67->U+38f, U+1f68->U+38f, U+1f69->U+38f, U+1f6a->U+38f, U+1f6b->U+38f, U+1f6c->U+38f, U+1f6d->U+38f, \
U+1f6e->U+38f, U+1f6f->U+38f, U+1f7c->U+38f, U+1fa0->U+38f, U+1fa1->U+38f, U+1fa2->U+38f, U+1fa3->U+38f, \
U+1fa4->U+38f, U+1fa5->U+38f, U+1fa6->U+38f, U+1fa7->U+38f, U+1fa8->U+38f, U+1fa9->U+38f, U+1faa->U+38f, \
U+1fab->U+38f, U+1fac->U+38f, U+1fad->U+38f, U+1fae->U+38f, U+1faf->U+38f, U+1ff2->U+38f, U+1ff3->U+38f, \
U+1ff4->U+38f, U+1ff6->U+38f, U+1ff7->U+38f, U+1ffa->U+38f, U+1ffc->U+38f, U+3d3->U+3d2, U+3d4->U+3d2, \
U+3db->U+3da, U+3dd->U+3dc, U+3df->U+3de, U+3e1->U+3e0, U+3e3->U+3e2, U+3e5->U+3e4, U+3e7->U+3e6, U+3e9->U+3e8, \
U+3eb->U+3ea, U+3ed->U+3ec, U+3ef->U+3ee, U+452->U+402, U+454->U+404, U+455->U+405, U+407->U+406, U+456->U+406, \
U+457->U+406, U+458->U+408, U+459->U+409, U+45a->U+40a, U+45b->U+40b, U+45f->U+40f, U+430->U+410, U+4d0->U+410, \
U+4d1->U+410, U+4d2->U+410, U+4d3->U+410, U+431->U+411, U+432->U+412, U+413->U+403, U+433->U+403, U+453->U+403, \
U+434->U+414, U+401->U+400, U+415->U+400, U+435->U+400, U+450->U+400, U+451->U+400, U+4d6->U+400, U+4d7->U+400, \
U+436->U+416, U+4c1->U+416, U+4c2->U+416, U+4dc->U+416, U+4dd->U+416, U+437->U+417, U+4de->U+417, U+4df->U+417, \
U+418->U+40d, U+438->U+40d, U+45d->U+40d, U+4e2->U+40d, U+4e3->U+40d, U+4e4->U+40d, U+4e5->U+40d, U+439->U+419, \
U+41a->U+40c, U+43a->U+40c, U+45c->U+40c, U+43b->U+41b, U+43c->U+41c, U+43d->U+41d, U+43e->U+41e, U+4e6->U+41e, \
U+4e7->U+41e, U+43f->U+41f, U+440->U+420, U+441->U+421, U+442->U+422, U+423->U+40e, U+443->U+40e, U+45e->U+40e, \
U+4ee->U+40e, U+4ef->U+40e, U+4f0->U+40e, U+4f1->U+40e, U+4f2->U+40e, U+4f3->U+40e, U+444->U+424, U+445->U+425, \
U+446->U+426, U+447->U+427, U+4f4->U+427, U+4f5->U+427, U+448->U+428, U+449->U+429, U+44a->U+42a, U+44b->U+42b, \
U+4f8->U+42b, U+4f9->U+42b, U+44c->U+42c, U+44d->U+42d, U+4ec->U+42d, U+4ed->U+42d, U+44e->U+42e, U+44f->U+42f, \
U+461->U+460, U+463->U+462, U+465->U+464, U+467->U+466, U+469->U+468, U+46b->U+46a, U+46d->U+46c, U+46f->U+46e, \
U+471->U+470, U+473->U+472, U+475->U+474, U+476->U+474, U+477->U+474, U+479->U+478, U+47b->U+47a, U+47d->U+47c, \
U+47f->U+47e, U+481->U+480, U+48d->U+48c, U+48f->U+48e, U+491->U+490, U+493->U+492, U+495->U+494, U+497->U+496, \
U+499->U+498, U+49b->U+49a, U+49d->U+49c, U+49f->U+49e, U+4a1->U+4a0, U+4a3->U+4a2, U+4a5->U+4a4, U+4a7->U+4a6, \
U+4a9->U+4a8, U+4ab->U+4aa, U+4ad->U+4ac, U+4af->U+4ae, U+4b1->U+4b0, U+4b3->U+4b2, U+4b5->U+4b4, U+4b7->U+4b6, \
U+4b9->U+4b8, U+4bb->U+4ba, U+4bd->U+4bc, U+4bf->U+4be, U+4c4->U+4c3, U+4c8->U+4c7, U+4cc->U+4cb, U+4d5->U+4d4, \
U+4d9->U+4d8, U+4da->U+4d8, U+4db->U+4d8, U+4e1->U+4e0, U+4e9->U+4e8, U+4ea->U+4e8, U+4eb->U+4e8, U+561->U+531, \
U+562->U+532, U+563->U+533, U+564->U+534, U+565->U+535, U+566->U+536, U+567->U+537, U+568->U+538, U+569->U+539, \
U+56a->U+53a, U+56b->U+53b, U+56c->U+53c, U+56d->U+53d, U+56e->U+53e, U+56f->U+53f, U+570->U+540, U+571->U+541, \
U+572->U+542, U+573->U+543, U+574->U+544, U+575->U+545, U+576->U+546, U+577->U+547, U+578->U+548, U+579->U+549, \
U+57a->U+54a, U+57b->U+54b, U+57c->U+54c, U+57d->U+54d, U+57e->U+54e, U+57f->U+54f, U+580->U+550, U+581->U+551, \
U+582->U+552, U+583->U+553, U+584->U+554, U+585->U+555, U+586->U+556, U+1fbb->U+1f71, U+1fc9->U+1f73, \
U+1fcb->U+1f75, U+1fdb->U+1f77, U+1feb->U+1f7b, U+1ff9->U+1f79, U+1ffb->U+1f7d, U+24d0->U+24b6, U+24d1->U+24b7, \
U+24d2->U+24b8, U+24d3->U+24b9, U+24d4->U+24ba, U+24d5->U+24bb, U+24d6->U+24bc, U+24d7->U+24bd, U+24d8->U+24be, \
U+24d9->U+24bf, U+24da->U+24c0, U+24db->U+24c1, U+24dc->U+24c2, U+24dd->U+24c3, U+24de->U+24c4, U+24df->U+24c5, \
U+24e0->U+24c6, U+24e1->U+24c7, U+24e2->U+24c8, U+24e3->U+24c9, U+24e4->U+24ca, U+24e5->U+24cb, U+24e6->U+24cc, \
U+24e7->U+24cd, U+24e8->U+24ce, U+24e9->U+24cf, U+ff41->U+ff21, U+ff42->U+ff22, U+ff43->U+ff23, U+ff44->U+ff24, \
U+ff45->U+ff25, U+ff46->U+ff26, U+ff47->U+ff27, U+ff48->U+ff28, U+ff49->U+ff29, U+ff4a->U+ff2a, U+ff4b->U+ff2b, \
U+ff4c->U+ff2c, U+ff4d->U+ff2d, U+ff4e->U+ff2e, U+ff4f->U+ff2f, U+ff50->U+ff30, U+ff51->U+ff31, U+ff52->U+ff32, \
U+ff53->U+ff33, U+ff54->U+ff34, U+ff55->U+ff35, U+ff56->U+ff36, U+ff57->U+ff37, U+ff58->U+ff38, U+ff59->U+ff39, U+ff5a->U+ff3a
}

index smf_delta_index : smf_base_index
{
index_exact_words = 1
expand_keywords = 1
index_field_lengths = 1
min_infix_len = 2
}

index smf_index
{
type			= distributed
index_exact_words = 1
expand_keywords = 1
min_infix_len = 2
index_field_lengths = 1
}

In standard form-based search I get results for words with apostrophe … However, when the search is passed via a URL parameter … I get no results at all

Sounds like an SMF issue, not Sphinx’ backend issue, since if it works for you with the form (I see it makes POST HTTP request) and is not working with GET (action=search2;search=%22you%27ve%22) then something is misconfigured in front of Sphinx which is SMF as I understand. Perhaps just GET is not supported.