Perhaps you should try some spelling variations:
nhanh dung » nhanh dong, hanh dung, nhanh hung
nhung cong » dung cong, thong cong, hang cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
dang cong » dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
dung cua » dung luan, dung cho
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang

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: doc hieu xanh - nhanh dung cua ((nhung cong) OR (dang cong)) ((dan than) OR (ban than)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - nhanh dung cua ((nhung cong) or (dang cong)) ((dan than) OR (ban than)) cau~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - nhanh dung cua ((nhung cong) or (dang cong)) ((dan than) OR (ban than)) cau*.