Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
nhung cong » dung cong, thong cong, hang cong
hanh dong » anh dong, ha dong
doc hieu » toc thieu, hoc thieu, hoc hien
dong cho » dung cho, dong co, dong hoc
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

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 nganh - hanh dong cho ((nhung cong) or (trong cong)) ((dan than) OR (van than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - hanh dong cho ((nhung cong) OR (trong cong)) ((dan than) OR (van than)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu nganh - hanh dong cho ((nhung cong) or (trong cong)) ((dan than) OR (van than)) cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu nganh - hanh dong cho ((nhung cong) or (trong cong)) ((dan than) OR (van than)) cau*.