Hello! Thanks for the review and sorry for the delay, I don't come here often. :) The best way to ask these is via email to daniel.rb.lobo+sss@gmail.com

It's possible that the search engine you are using uses a different text encoding than UTF-8, requiring conversion of characters in the URL. Please select that engine in the options page and try changing its "Text encoding" to KOI8-R or KOI8-RU, for example. This involves a bit trial and error, but one of them may work, since these are encodings commonly used for Russian words. :)

Cheers!
Daniel