Perhaps you should try some spelling variations:
thanh trung » thanh tung
trung cong » truong cong, trong cong, trung uong
hieu quan » hieu qua, lieu quan, thien quan
chu quang » chat quang, vu quang
trung cua » truong cua, trung tuan, trung cap
cua trung » cua truong, xuan trung, cua nhung
cong san » cong tac
toan cau » toan cao, toan ban, toan tai
toan tap » toan ban

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: ho ((hieu quan) OR (chu quang)) - thanh trung cua trung cong san ((toan cau) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((hieu quan) or (chu quang)) - thanh trung cua trung cong san ((toan cau) OR (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: ho ((hieu quan) or (chu quang)) - thanh trung cua trung cong san ((toan cau) OR (toan tap))*.