Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung tac » trung tam, trong tac, trung tai
trong dan » trong dang, trong san, trong tan
doc hieu » toc thieu, hoc thieu
tac dung » sach dung, xay dung, tin dung
dan than » dan chan, ban than, van than
than cap » khan cap, thanh lap, thanh cac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc hieu) or (hoc hien)) lang - thanh trung tac dung trong dan than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (hoc hien)) lang - thanh trung tac dung trong dan than cap.
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) or (hoc hien)) lang - thanh trung tac dung trong dan than cap*.