Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
hieu manh » chieu xanh, hieu nganh, dieu hanh
canh tran » canh tranh, hanh trang, banh trang
hang cong » dang cong, hang nong, bang cong
tran van » luan van
van hang » van khang, van hoang, van thang
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than ban » thanh ban, toan ban, than man

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((chieu sach) or (hieu manh)) - canh tran van hang cong dan than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((chieu sach) OR (hieu manh)) - canh tran van hang cong dan than ban*.