Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu lang » chieu sang, hieu quang, nhieu tang
danh luan » doanh luan, dan luan, tranh luan
anh danh » anh anh, anh dang, anh dinh
luan han » luan hoan, luan phan, luan van
han cong » phan cong, hang cong, hanh cong
cong tan » cong tac, cong san, cong thanh
van chat » cao chat
tan van » tran van, tang 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: theo ((chieu sach) or (hieu lang)) - anh danh luan han cong tan van chat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (hieu lang)) - anh danh luan han cong tan van chat*.