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 san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh

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 tan)) 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 tan)) thanh cac".
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - thanh trung xay dung ((cong dan) OR (cong tan)) thanh cac*.