Cyrillic and latin characters does not displays while used as headers(h1,h2,etc)

Dear support,

I have an issue with using Russian and Czech language with my project. Normal latin chars(US) displays OK, but when I am trying to create same translated pages, I have a problems with headers(h1,h2,etc) if I am trying to write in Russian/Czech. Russian doesn’t displays at all, Czech displaying only classic latin char-s from US alphabet/

Take a look at my website, at the first page(index)
http://auto4you.co/

You can see there:
Welcome! (ivnostensk rejstk)

but you should see this in brackets – (živnostenský rejstřík)

with Russian you see empty brackets:
We provide quality service of importing cars ( ) from Germany.

and it should be – We provide quality service of importing cars (Импорт авто) from Germany.

Probably font you used doesn’t have Cyrillic and those special Czech chars included.. Is it possible to solve this problem somehow or may be I could use some other fonts/styles?