Perhaps you should try some spelling variations:
thanh trung » thanh tung
hieu quan » hieu qua, lieu quan, thien quan
trung cua » truong cua, trung tuan, trung cap
dung cong » dung trong
cua dung » cua dang, cua dong, qua dung
cong dan » cong san, cong tan, huong dan
than cau » toan cau, than cap, thanh chau
phan cau » phan dau, phan cac, phan tu

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: doi ((chinh sach) OR (hieu quan)) - thanh trung cua dung cong dan ((than cau) OR (phan cau))~.
• Adding a wildcard symbol may retrieve word variants: doi ((chinh sach) or (hieu quan)) - thanh trung cua dung cong dan ((than cau) or (phan cau))*.