Perhaps you should try some spelling variations:
chieu sach » chinh sach, chieu sang, chieu xanh
nang nguoi » tang nguoi, nhung nguoi, thang nguoi
tranh cac » trinh cac, thanh cac, tranh cai
cac nang » cam nang, cao nang, cac dang
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

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

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