Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chieu sang, chieu xanh
trung van » truong van, trong van, trung va
dung cong » dung trong
van dung » van dong, xay dung, tin dung
cong san » cong tac
san tran » tan tran, ban tran, dang tran
tran tap » toan tap, tran tan, tran tuan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chiet tach) or (chieu sach)) - thanh trung van dung cong san tran tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chiet tach) OR (chieu sach)) - thanh trung van dung cong san tran tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((chiet tach) or (chieu sach)) - thanh trung van dung cong san tran tap*.