Perhaps you should try some spelling variations:
chiet tach » chieu sach
hanh trinh » canh tranh, hanh chinh
nhung cong » dung cong, thong cong, hang cong
van thanh » ban thanh, van tuan
ho chiet » ho chieu, ho thiet, hoc thiet
trinh va » trinh van, trinh vat, trinh ve
dan toan » van toan, dan than, manh toan
ban than » ban thanh, ban hang, ban hanh

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chiet tach - hanh trinh va nhung cong ((dan toan) or (((ban than) OR (van thanh)))) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - hanh trinh va nhung cong ((dan toan) OR (((ban than) OR (van thanh)))) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chiet tach - hanh trinh va nhung cong ((dan toan) or (((ban than) OR (van thanh)))) cau".
• Adding a wildcard symbol may retrieve word variants: ho chiet tach - hanh trinh va nhung cong ((dan toan) or (((ban than) OR (van thanh)))) cau*.