Perhaps you should try some spelling variations:
thanh trung » thanh tung
theo hieu » theo chieu, theo tieu, thien hieu
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
trung ap » trung cap, trung lap, trung tam
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang
ap dung » xay dung, van 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: theo hieu lang - thanh trung ap dung cong ((dan than) OR (ban than)) cau~.
• Adding a wildcard symbol may retrieve word variants: theo hieu lang - thanh trung ap dung cong ((dan than) or (ban than)) cau*.