Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
trung cao » truong cao, trung cap, trung co
thanh cac » hanh cac, thanh bac, thanh ca
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, than cua

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 lang - thanh trung cao dung ((cong dan) or (cong tan)) ((than cap) OR (thanh cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc hieu lang - thanh trung cao dung ((cong dan) OR (cong tan)) ((than cap) OR (thanh cac)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc hieu lang - thanh trung cao dung ((cong dan) or (cong tan)) ((than cap) OR (thanh cac))".
• Adding a wildcard symbol may retrieve word variants: toc hieu lang - thanh trung cao dung ((cong dan) or (cong tan)) ((than cap) OR (thanh cac))*.