In a Basic and Bible searches, it appears that Greek accents and other diacritical marks are ignored for searches. This is convenient since I can just type the letters and not the accents or breathing marks when searching a grammar book or other reference book.
However, if I enter the breathing marks, they are still ignored for searches. So if I want to find places where εἷς (“one”) is mentioned in my Greek grammar books, I get numerous false matches with εἰς (“into”), since the only only differ in the breathing mark.
In Bible searches this is not a problem since I can search on the lemma or add ANDEQUALS "one" to narrow it down by meaning. But this is not possible in non-biblical resources.
I tried turning off Match All Word Forms and I tried turning on Match Case, but nothing changed.
How can I search for an exact form of a word with diacritical marks?