Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
viet sach » viet anh, dien sach, viet tech
dong luan » dung luan, tong luan, dong xuan
luan dung » lan dung, luan dong, luan hung
dung cong » dung trong
anh dong » anh huong, anh son
cong san » cong tac
toan cao » toan tap
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((viet sach) or (chieu sach)) - anh dong luan dung cong san ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((viet sach) OR (chieu sach)) - anh dong luan dung cong san ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: theo ((viet sach) or (chieu sach)) - anh dong luan dung cong san ((toan cao) or (toan ban))*.