Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
nang hang » nang sang, hang hang, cang thang
hoc hieu » hoc thieu, hoc hien, doc hieu
van dang » van dong, van dung, van nang
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang
va nang » van nang, da nang, cam nang

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

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