Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
doanh hoan » doanh doanh, doanh khoa, doanh nhan
hieu manh » chieu xanh, hieu nganh, dieu hanh
cong san » cong tac
va hang » van hang, va lang, va hanh
va nang » van nang, da nang, cam nang
san van » tan van, luan van, tran van

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: ho ((hieu manh) OR (chieu tinh)) - doanh hoan ((va hang) OR (va nang)) cong san van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu manh) or (chieu tinh)) - doanh hoan ((va hang) OR (va nang)) cong san van ban~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu manh) or (chieu tinh)) - doanh hoan ((va hang) OR (va nang)) cong san van ban*.