Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, dieu hanh
hanh tran » hanh trang, thanh tran, hanh tram
hang cong » dang cong, hang nong, bang cong
tran van » luan van
van hang » van khang, van hoang, van thang
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
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: theo ((chieu sach) or (hieu manh)) - hanh tran van hang cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chieu sach) OR (hieu manh)) - hanh tran van hang cong tan toan cau.
• Adding a wildcard symbol may retrieve word variants: theo ((chieu sach) or (hieu manh)) - hanh tran van hang cong tan toan cau*.