Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
dung cong » dung trong
hoc hieu » hoc thieu, hoc hien, doc hieu
dan toan » van toan, dan than, manh toan
dan chan » dan gian, dan ca, van chat

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - canh tranh cua ((nhung cong) or (dung cong)) ((dan toan) or (dan chan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh tranh cua ((nhung cong) OR (dung cong)) ((dan toan) OR (dan chan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh cua ((nhung cong) or (dung cong)) ((dan toan) or (dan chan)) cau*.