Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
lieu tinh » trieu tinh, diep tinh, bien tinh
nhan dang » nhan dan, phan dang, tran dang
dang luan » dung luan, tang luan, hang luan
luan dong » luan cong, quan dong, luan nong
cong tac » cong ty
toan cau » toan cao, toan ban, toan tap

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) or (lieu tinh)) - nhan dang luan dong ((cong san) or (cong tac)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (lieu tinh)) - nhan dang luan dong ((cong san) OR (cong tac)) toan cau.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (lieu tinh)) - nhan dang luan dong ((cong san) or (cong tac)) toan cau*.