Perhaps you should try some spelling variations:
thanh trong » thanh trung, tranh trong, hanh trong
trong tac » trong cac, tuong tac, trong tan
dung cong » dung trong
chi sach » chinh sach, chieu sach, moi sach
tac dung » sach dung, xay dung, tin dung
cong dan » cong san, cong tan, huong dan
toan cao » toan tap
toan ban » van ban
co sach » bo sach, cuon sach, hoc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chi sach) or (co sach)) - thanh trong tac dung cong dan ((toan cao) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chi sach) OR (co sach)) - thanh trong tac dung cong dan ((toan cao) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: doi ((chi sach) or (co sach)) - thanh trong tac dung cong dan ((toan cao) or (toan ban))*.