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I checked if it's utf-8 but I think it's the font. How to fix this problem?

Now I try to add thai font and it has a problem with floating pools as shown in the picture. Thai language should be like this ex. เริ่มแคมเปญใหม่ , ตัวเลือก,...

Thank you very much, but I tried all the Thai fonts, but it didn't work. I think I can't do anything with the Thai language. And I'm sorry. Thank you...