Sorry to hear that Vladimir, but thanks for trying! Are you using Chrome? Other browsers may appear to work but are not accepting continuous input (Firefox seems to have that issue) -- you can check if it is recognizing your words in the browser console.
I have not tested it with anything other than my voice (English - American male) and microphones so it is possible that poor quality mics and/or other accents have a side effect on the speech recognition that I didn't encounter.