Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
nhieu tang » chieu sang, hieu lang, nhiet nang
hanh bang » anh bang, hanh mang, lanh bang
bang luan » tang luan, hang luan, dung luan
luan nang » luan van, van nang, luan san
nang cong » nang song, dang cong, bang cong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than cao » toan cao, thai cao, than cap

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 (nhieu tang)) - hanh bang luan nang cong dan than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (nhieu tang)) - hanh bang luan nang cong dan than cao.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (nhieu tang)) - hanh bang luan nang cong dan than cao*.