Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
hanh tranh » canh tranh, hanh trinh, hanh trang
nhung cong » thong cong, hang cong, nhung don
tranh cua » doanh cua, manh cua
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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 tranh cua ((nhung cong) or (dung cong)) ((dan toan) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu nganh - hanh tranh cua ((nhung cong) OR (dung cong)) ((dan toan) OR (dan than)) cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu nganh - hanh tranh cua ((nhung cong) or (dung cong)) ((dan toan) or (dan than)) cau*.