Yandex search engine doesn't work

Hello everyone!
I have a problem with Yandex search engine in Safari Version 9.1.2 (11601.7.7), OS X El Capitan version 10.11.6

This search engine doesn't work in URL Tab
I found similar topic Google search bar doesn't work on Safari

but there is no solution for this problem.

I tried: restart Safari/Macbook, clear cache, disable & delete extensions, disable & enable checkboxes on a "Search" tab in Preferences.

Also I tried to launch Safari in Guest account and rebooting Macbook into the safe mode. It also didn't help.

P.S. Others search engines works good.Can you suggest me any ideas to fix it?