Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
hanh dung » thanh dung, anh dung, hanh dong
dung cong » dung trong
hang nong » thang long, han tong
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 - hanh dung cua ((dung cong) OR (hang nong)) ((dan than) OR (ban than)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh dung cua ((dung cong) or (hang nong)) ((dan than) OR (ban than)) cau~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh dung cua ((dung cong) or (hang nong)) ((dan than) OR (ban than)) cau*.