Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hoc hieu » hoc thieu, hoc hien, doc hieu
tranh va » tranh van, trang va, trinh va
dan than » dan chan, ban than, van than
van phan » van phong, van thanh, luan phan
va nang » van nang, da nang, cam nang
va phan » va phat, va phap, hoa phan

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 va nang song ((((dan than) or (va phan))) or (van phan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh tranh va nang song ((((dan than) OR (va phan))) OR (van phan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh va nang song ((((dan than) or (va phan))) or (van phan)) cau*.