Perhaps you should try some spelling variations:
thanh trung » thanh tung
nhiet nang » nhiet dong, viet nang, nhieu tang
trung cua » truong cua, trung tuan, trung cap
cua trung » cua truong, xuan trung, cua nhung
thanh man » thanh san, thanh van, thanh mau
cong ban » cong bang, cong tan, cong dan
cong san » cong tac

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 ((chinh sach) OR (nhiet nang)) - thanh trung cua trung ((cong ban) OR (cong san)) thanh man~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chinh sach) or (nhiet nang)) - thanh trung cua trung ((cong ban) OR (cong san)) thanh man~".
• Adding a wildcard symbol may retrieve word variants: hoc ((chinh sach) or (nhiet nang)) - thanh trung cua trung ((cong ban) OR (cong san)) thanh man*.