Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
nhung cong » thong cong, hang cong, nhung don
hieu lang » chieu sang, hieu quang, nhieu tang
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
ban hanh » ban hang
hanh cac » hang cac, hanh cat, hanh cham

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 doanh nhan ((nhung cong) or (dung cong)) ban hanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu lang - doanh doanh nhan ((nhung cong) OR (dung cong)) ban hanh cac.
• Adding a wildcard symbol may retrieve word variants: doc hieu lang - doanh doanh nhan ((nhung cong) or (dung cong)) ban hanh cac*.