Perhaps you should try some spelling variations:
chiet tach » chieu sach
canh trinh » canh tranh, hanh trinh, canh tinh
hoc chiet » hoc thiet, hoc nhiet, hoc hien
trinh va » trinh van, trinh vat, trinh ve
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
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: hoc chiet tach - canh trinh va nhung ((cong dan) or (cong san)) than ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc chiet tach - canh trinh va nhung ((cong dan) OR (cong san)) than ban.
• Adding a wildcard symbol may retrieve word variants: hoc chiet tach - canh trinh va nhung ((cong dan) or (cong san)) than ban*.