Perhaps you should try some spelling variations:
trung tuan » trung thanh, trung tam, tran tuan
hieu lang » chieu sang, hieu quang, nhieu tang
trung cua » truong cua, trung cap, dung cua
cong ban » cong bang, cong san, cong tan
cong tac » cong ty
phan cau » phan dau, phan cac, phan tu
ho hieu » ho chieu, hoi hieu, nho hieu

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 lang - manh ((trung cua) OR (trung tuan)) ban ((cong ban) OR (cong tac)) phan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - manh ((trung cua) OR (trung tuan)) ban ((cong ban) or (cong tac)) phan cau~".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - manh ((trung cua) OR (trung tuan)) ban ((cong ban) or (cong tac)) phan cau*.