Perhaps you should try some spelling variations:
thanh trung » thanh tung
chieu sach » chinh sach, chieu sang, chieu xanh
dung cong » dung trong
trung va » truong va, trang va, trung ha
cong san » cong tac
tran tap » toan tap, tran tuan, trang tai
tran tan » tran tuan, tran van, tran thanh
va dung » van dung, va duong, vat dung

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 va dung cong san ((tran tap) OR (tran tan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chiet tach) OR (chieu sach)) - thanh trung va dung cong san ((tran tap) OR (tran tan)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chiet tach) or (chieu sach)) - thanh trung va dung cong san ((tran tap) OR (tran tan))".
• Adding a wildcard symbol may retrieve word variants: hoc ((chiet tach) or (chieu sach)) - thanh trung va dung cong san ((tran tap) OR (tran tan))*.