Perhaps you should try some spelling variations:
cho chinh » chon chinh, che chinh, cuoc chinh
dung cong » dung trong
tran manh » tran minh, tran thanh, tran van
hanh han » hanh nhan, hanh phan, anh han
hanh san » thanh san, khach san, thanh son
cong tac » cong ty
va dung » van dung, va duong, vat dung
than ma » than man, than va, khan ma

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: cho chinh sach - ((hanh han) OR (hanh san)) va dung cong tac ((tran manh) OR (than ma))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "cho chinh sach - ((hanh han) OR (hanh san)) va dung cong tac ((tran manh) or (than ma))~".
• Adding a wildcard symbol may retrieve word variants: cho chinh sach - ((hanh han) OR (hanh san)) va dung cong tac ((tran manh) or (than ma))*.