Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
dang cong » dung cong
doc hieu » toc thieu, hoc thieu, hoc hien
trinh va » trinh van, trinh vat, trinh ve
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 manh - hanh trinh va ((nhung cong) or (dang cong)) ((dan toan) or (dan than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - hanh trinh va ((nhung cong) OR (dang cong)) ((dan toan) OR (dan than)) cau.
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - hanh trinh va ((nhung cong) or (dang cong)) ((dan toan) or (dan than)) cau*.