Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quang » thieu quang, hieu quan, hieu qua
trung cao » truong cao, trung cap, trung co
toc hieu » toc thieu, doc hieu, hoc thieu
cao dung » cao dang, cao dong, cao ung
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
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: toc hieu quang - thanh trung cao dung ((cong dan) or (cong tan)) than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu quang - thanh trung cao dung ((cong dan) OR (cong tan)) than cap.
• Adding a wildcard symbol may retrieve word variants: toc hieu quang - thanh trung cao dung ((cong dan) or (cong tan)) than cap*.