How to fix incorrect display of special characters of the included font?

Question

css

I connected a font with Tatar characters to the site:

@font-face {
  font-family: Trebizond;
  src: url(fonts/Lead/XO_Trebizond_Nu.ttf);
}

But it shows me special Tatar letters like this:

I checked it in Word with the font installed: it doesn't work, Times New Roman is set:

What could be the problem?
I don't know what else might be needed to solve the problem...

.leadthing {
  width:100%;
  margin:-2px 0px;
  font-family: Trebizond;
}

This is?
I don’t even know which way to dig, I don’t understand how to google ...
UPD: And the chest just opened. These fonts simply do not have these characters - I checked it through the font editor. Developers of "My Office" - you amazing liars!