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 » dang cong, hang nong, bang cong
tran van » luan van
van hang » van khang, van hoang, van thang
dan chan » dan gian, dan ca, van chat
van phan » van phong, van thanh, luan phan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho ((chieu sach) OR (chiet tach)) - canh tran van hang cong ((dan chan) or (van phan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (chiet tach)) - canh tran van hang cong ((dan chan) OR (van phan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) OR (chiet tach)) - canh tran van hang cong ((dan chan) or (van phan)) cau".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) OR (chiet tach)) - canh tran van hang cong ((dan chan) or (van phan)) cau*.