[@Tayseer] No, it can search text in any language, as long as the file is encoded in UTF-8, ANSI, or another format with a proper BOM (byte order mark).
That said, we plan to improve search functionality for non-English languages. For example, searching for cafe-theatre will also match café-théâtre, and vice versa. This feature is already available in some of our other Vovsoft applications and is currently being implemented for this program as well.