The tool is challenged by Cyrillic letters, as most countries use a mix of Cyrillic and Latin in mentions posted by the general public.
We are constantly modifying the way the tool searches Cyrillic mentions in order to capture a larger portion of the mentions.
To find mentions of i.e. "Мобиком" in the future, we recommend making keywords case sensitive - i.e. Moбикoм* (Latin keyboard) OR мoбикoм* (Cyrillic keyboard).