Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhung cong » dung cong, thong cong, hang cong
doi chieu » doc hieu, doi chi, ho chieu
anh tang » anh bang, anh dang, anh sang
anh nang » ganh nang, anh bang, anh dang
cong tan » cong tac, cong san, cong thanh
than cau » toan cau, phan cau, than cap
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chieu sach - ((anh tang) or (anh nang)) va nhung cong tan ((than cau) or (toan tap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - ((anh tang) OR (anh nang)) va nhung cong tan ((than cau) OR (toan tap)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - ((anh tang) or (anh nang)) va nhung cong tan ((than cau) or (toan tap))*.