Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
hoc hieu » hoc thieu, hoc hien, doc hieu
cua dang » cua cong, cua ban
cong van » cong vang, song van, cong tan
cong san » cong tac
phan dau » phan tu, hang dau
phan cac » nhan cach, phan lap, phan 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: hoc hieu manh - canh tranh cua dang ((cong van) OR (cong san)) ((phan dau) OR (phan cac))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - canh tranh cua dang ((cong van) OR (cong san)) ((phan dau) or (phan cac))~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh cua dang ((cong van) OR (cong san)) ((phan dau) or (phan cac))*.