Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang cong » dang cong, hang nong, bang cong
tranh va » tranh van, trang va, trinh va
cong tan » cong tac, cong san, cong thanh
than man » thanh san, tran manh, than phan
va hang » van hang, va nang, va lang
than ma » than va, khan ma, nhan ma

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) or (chinh sach)) - canh tranh va hang cong tan ((than man) or (than ma))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chinh sach)) - canh tranh va hang cong tan ((than man) OR (than ma)).
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chinh sach)) - canh tranh va hang cong tan ((than man) or (than ma))*.