Perhaps you should try some spelling variations:
doanh dung » doanh chung, doanh nhung, doanh quang
dung quang » dang quang, dung quan, luong quang
hieu lang » chieu sang, hieu quang, nhieu tang
dang cong » dung cong
ban nhanh » ban hanh, ban thanh, ban nhan
doc hieu » toc thieu, hoc thieu, hoc hien
nhanh ha » thanh hoa, thanh hai, khanh hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu lang - doanh dung quang ((phung van) or (dang cong)) ban nhanh ha~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - doanh dung quang ((phung van) OR (dang cong)) ban nhanh ha.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - doanh dung quang ((phung van) or (dang cong)) ban nhanh ha*.