This has come up numerous times in the forums, and I couldn't find any UserVoice item that mentioned it, so I've added a new one. Please vote for it if you'd like Logos to be able to do what it used to be able to do in Libronix (Logos 3): search for a word with or without an accent, and have a way of limiting search results to only the instances that exactly match the accent or lack of accent in the search text.
http://logos.uservoice.com/forums/42823-logos-bible-software-5/suggestions/3846934-bring-back-accented-search-from-libronix-
