Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
doi chieu » doc hieu, doi chi, mot chieu
cong luan » tong luan, cong tuan, dong luan
luan phan » luan van, luan hoan
cong tan » cong tac, cong san, cong thanh
tran tan » tran tuan, tran thanh, trang tuan
tran van » luan van

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 - thanh cong luan phan cong tan ((tran tan) or (tran van))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chieu sach - thanh cong luan phan cong tan ((tran tan) OR (tran van)).
• Adding a wildcard symbol may retrieve word variants: doi chieu sach - thanh cong luan phan cong tan ((tran tan) or (tran van))*.