Perhaps you should try some spelling variations:
chiet tach » chieu sach
manh tran » manh toan, manh tuan, canh tranh
tran van » luan van
van hang » van khang, van hoang, van thang
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
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: hoc ((nhiet tach) or (chiet tach)) - manh tran van hang ((cong dan) or (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((nhiet tach) OR (chiet tach)) - manh tran van hang ((cong dan) OR (cong tan)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((nhiet tach) or (chiet tach)) - manh tran van hang ((cong dan) or (cong tan)) toan cau*.