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