how to convert back to utf-8

[Goang14]

I have a task like this, I want to convert it to the desired Vietnamese text (ĐƠN CAM KẾT)

i am using ctimes in mpdf

[ssieb]

That looks like the characters are gone. I don't think you're going to get it back. Where did the text come from?

[Goang14]

• đây là khi tôi sử dụng dejavusans
  

• đây là khi tôi sử dụng ctimes
  

[ssieb]

Then the font just doesn't have those characters. You'll have to use a font that does.

[Goang14]

help me fix this.

[ssieb]

Don't use "ctimes". (I don't even know what font that is.)

[Goang14]

it is Times New Roman.