Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sang » chieu sach, chieu xanh, nhieu tang
hieu lang » hieu quang, nhieu tang, hieu van
nhung cau » chung cu, nhung bai, nhu cau
trung ha » trung hoc, trung tam, trung cap
ha thong » hoa thong, nha thong, he thong
cong ban » cong bang, cong san, cong dan
cong tan » cong tac, cong san, cong thanh

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sang) OR (hieu lang)) - thanh trung ha thong ((cong ban) OR (cong tan)) nhung cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sang) or (hieu lang)) - thanh trung ha thong ((cong ban) OR (cong tan)) nhung cau~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sang) or (hieu lang)) - thanh trung ha thong ((cong ban) OR (cong tan)) nhung cau*.