Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
thanh tung » thanh cong
hieu lang » chieu sang, hieu quang, nhieu tang
cuong tap » luong tap, cong tac, luong tai
cong tap » cong tac, cong tan, tong tap
quan cao » quang cao, quan cau, quan ao
tung va » trung va, tuong va, dung va
va dung » van dung, va duong, vat dung

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 tinh) OR (hieu lang)) - thanh tung va dung ((cong tap) OR (cuong tap)) quan cao~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu tinh) or (hieu lang)) - thanh tung va dung ((cong tap) OR (cuong tap)) quan cao~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu tinh) or (hieu lang)) - thanh tung va dung ((cong tap) OR (cuong tap)) quan cao*.