Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, ho chieu
doanh cua » doanh luan
dung cong » dung trong
manh cua » ban cua
cong tan » cong tac, cong san, cong thanh
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau

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 - cach ((manh cua) or (doanh cua)) dung cong tan ((phan cau) or (phan dau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - cach ((manh cua) OR (doanh cua)) dung cong tan ((phan cau) OR (phan dau)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - cach ((manh cua) or (doanh cua)) dung cong tan ((phan cau) or (phan dau))*.