Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
canh tran » canh tranh, hanh trang, banh trang
hang cong » hang nong, bang cong, thanh cong
dang cong » dung cong
van thanh » ban thanh, van tuan
thanh ban » thanh san, thanh van, thanh bac
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: doi ((chieu sach) or (chiet tach)) - canh tran van ((hang cong) or (dang cong)) van thanh ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (chiet tach)) - canh tran van ((hang cong) OR (dang cong)) van thanh ban.
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (chiet tach)) - canh tran van ((hang cong) or (dang cong)) van thanh ban*.