Perhaps you should try some spelling variations:
hieu lang » chieu sang, hieu quang, nhieu tang
van nhanh » van thanh, van hanh, van khanh
nhanh cau » nhanh cay, thanh chau, nhanh ha
hop hieu » hop nhieu, hoi hieu, hoc thieu
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
cong van » cong vang, cong san, song van

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

• Performing a fuzzy search may retrieve terms with similar spellings: hop hieu lang - canh tranh ((cua dung) or (cua dong)) cong van nhanh cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hop hieu lang - canh tranh ((cua dung) OR (cua dong)) cong van nhanh cau.
• Adding a wildcard symbol may retrieve word variants: hop hieu lang - canh tranh ((cua dung) or (cua dong)) cong van nhanh cau*.