Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
doc hieu » toc thieu, hoc thieu, hoc hien
cap dung » ap dung, cao dung, chan dung
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: doc hieu lang - ((thanh trung) or (thanh tung)) cap dung ((cong dan) OR (cong tan)) than cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - ((thanh trung) OR (thanh tung)) cap dung ((cong dan) OR (cong tan)) than cap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu lang - ((thanh trung) or (thanh tung)) cap dung ((cong dan) OR (cong tan)) than cap".
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - ((thanh trung) or (thanh tung)) cap dung ((cong dan) OR (cong tan)) than cap*.