Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
cua nhung » va nhung
chinh can » chinh ca, chinh ban, chinh cau
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
phan cau » phan dau, phan cac, phan tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu manh - canh tranh cua nhung ((cong tan) or (cong san)) ((phan cau) or (chinh can))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu manh - canh tranh cua nhung ((cong tan) OR (cong san)) ((phan cau) OR (chinh can)).
• Adding a wildcard symbol may retrieve word variants: doc hieu manh - canh tranh cua nhung ((cong tan) or (cong san)) ((phan cau) or (chinh can))*.