Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
chieu tinh » trieu tinh, lieu tinh, chau tinh
hanh trang » thanh trung, canh tranh, hanh trinh
cua dung » cua dang, cua dong, cua rung
qua dung » quang dung, su dung, qua song
cong tan » cong tac, cong san, cong thanh
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: hoc ((chieu sach) or (chieu tinh)) - hanh trang ((cua dung) or (qua dung)) cong tan tran van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu sach) OR (chieu tinh)) - hanh trang ((cua dung) OR (qua dung)) cong tan tran van.
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu sach) or (chieu tinh)) - hanh trang ((cua dung) or (qua dung)) cong tan tran van*.