Perhaps you should try some spelling variations:
thanh tung » thanh cong
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
cua nhung » va nhung
tan phan » toan phan, than phan, tai phan
van phan » van phong, van thanh, luan phan
ho hieu » ho chieu, hoi hieu, nho hieu

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 hieu lang - ((thanh trung) OR (thanh tung)) cua nhung cong ((tan phan) OR (van phan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - ((thanh trung) or (thanh tung)) cua nhung cong ((tan phan) OR (van phan)) cau~".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - ((thanh trung) or (thanh tung)) cua nhung cong ((tan phan) OR (van phan)) cau*.