Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu lang » chieu sang, hieu quang, nhieu tang
trung xay » trong xay, trung gay, trung tam
thanh cac » hanh cac, thanh bac, thanh ca
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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: doc hieu lang - thanh trung xay dung ((cong dan) or (cong san)) ((than cap) OR (thanh cac))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - thanh trung xay dung ((cong dan) OR (cong san)) ((than cap) OR (thanh cac))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu lang - thanh trung xay dung ((cong dan) or (cong san)) ((than cap) OR (thanh cac))*".