title: Some special Vietnamese characters wrong size when use custom font
body: <p>I follow this <a href="https://stackoverflow.com/questions/10367091/xcode-custom-ttf-font-not-working">question</a> to add this <a href="https://github.com/lequysang/gitfiles02/blob/master/VPSVYT.TTF" rel="nofollow noreferrer">custom font</a> and it work.</p>
  
  <pre><code>[self.textView setFont:[UIFont fontWithName:@"VPS_Vinh_Yen_Thuong" size:26]];
  </code></pre>
  
  <p>But there are some special characters become bigger and not follow font format after typing like this:
  <img src="https://i.stack.imgur.com/ayCjA.png" alt="enter image description here"></p>
  
  <p>This problem don't happen when set font of UITextView to Arial.</p>
  
  <p>Please guide me what I need to do to solve it.
  Thanks!</p>