Perhaps you should try some spelling variations:
trien quang » tran quang, tuyen quang, dien quang
thanh trung » thanh tung
thong cong » trong cong, tong cong, thong thong
hieu quan » hieu qua, lieu quan, thien quan
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cau » toan cau, phan cau, than cap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu quan) or (trien quang)) - thanh trung cua thong cong dan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu quan) OR (trien quang)) - thanh trung cua thong cong dan than cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu quan) or (trien quang)) - thanh trung cua thong cong dan than cau*.