Perhaps you should try some spelling variations:
doanh hoan » doanh doanh, doanh khoa, doanh nhan
hoan quang » doan quang, doanh quang, hoach quang
nhung cong » dung cong, thong cong, nhung don
hieu lang » chieu sang, hieu quang, nhieu tang
hang cong » dang cong, hang nong, bang cong
doc hieu » toc thieu, hoc thieu, hoc hien
ban nhan » ban than, van nhan, ban thanh
nhan bac » nhanh bac, ngan bac, nha bac

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 hoan quang ((nhung cong) or (hang cong)) ban nhan bac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - doanh hoan quang ((nhung cong) OR (hang cong)) ban nhan bac*.