You need to specify which search bar you are using - the one that searches across all notes in the top toolbar, or the one that searches only in the current one, in the bottom status bar.
I am using global search in the top toolbar (F6).
Thanks, would you mind posting an example note in Russian and an example query for what you mentioned here?
for a word that begins with a capital letter, and in the text this word is written with a small letter, then it will not be found.
I'm not sure I can even fix this since I don't know Russian but can give it a try.
This text, for example: "Агентство Рейтер со ссылкой на источник сообщило, что все сотрудники Госдепа США будут эвакуированы из Сирии в течение суток. Все вооруженные силы США покинут арабскую республику, когда закончатся финальные стадии операции против ИГ".
Bug № 1. If you search for "рейтер" (with a small letter), you will not find anything. And if you search for "Рейтер", you will find it.
Bug № 2. If you search for the "Госдеп" (incomplete version of the word), you will not find anything. And if you look for the "Госдепа", then the word will be found.
search is a bit fleaky.
I was searching for "icon" and it would not find "icons". Then just before writing I tried again, and this time the search for "icon" found "icons" ! ?
Search for Russian text should be improved in latest release, but let me know if you notice something not right.