Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
hanh dong » anh dong, ha dong
luan hung » luan chung, lan hung, tuan hung
cong tang » cong thang, cong tan, cong lang
luan ung » luon ung, luan chung, luan luong
tai cau » tai cac
tai cao » thai cao, tao cao, tai sao

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - hanh dong ((luan hung) OR (luan ung)) cong tang ((tai cau) OR (tai cao))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi chieu sach - hanh dong ((luan hung) or (luan ung)) cong tang ((tai cau) OR (tai cao))~".
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - hanh dong ((luan hung) or (luan ung)) cong tang ((tai cau) OR (tai cao))*.