https://bookbrainz.org/edition-group/b6ee7c4f-5da0-4ec7-b8d5-ff519f801101
https://bookbrainz.org/edition/12bb73f9-d5c0-44a8-97bd-88a1bb27df11
https://bookbrainz.org/work/2a35b0c4-0840-442c-a763-418fb63a27e5

I recently added this edition group, edition and work, all of which have the same Greek title. Most words in Greek bear a diacritic on one of their vowels, the acute accent and occasionally the diaresis, which can be on the same or a different vowel as the acute accent (but if a title is spelled in the old polytonic orthography, then there can be more than just these two diacritics). In this title, the last word is the Greek translation of the Sumerian name "Gilgamesh". It is spelled with an acute accent on its first vowel (Γκίλγκαμες), however the most common spelling has an acute on its last vowel (Γκιλγκαμές). If I search for the book using the most common spelling, I get no results. However if I don't type any accented characters at all, then these entities do come up. I've also tested this, by accenting the second vowel (Γκιλγκάμες), which also gave me no results. Another thing I did is type all of the polytonic diacritics on each of the three vowels, one at a time, and I only got results when I typed them on the first one. So, the only way successfully search for these entities is to either use no diacritics or use any diacritic (polytonic or not) on the first vowel only - placing them on any other vowel will give no results. I believe this is the bug, as the search is supposed to ignore accented characters.