Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
hanh dang » hanh dong, anh dang, hanh dung
dung cong » dung trong
dang vat » dang van, dong vat, dang nhat
vat dung » van dung, va dung, viet dung
cong tan » cong tac, cong san, cong thanh
tan nhat » tran nhat, tan phat, lan nhat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu sach) or (chiet tach)) - hanh dang vat dung cong tan nhat ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chiet tach)) - hanh dang vat dung cong tan nhat ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chiet tach)) - hanh dang vat dung cong tan nhat ban*.