Perhaps you should try some spelling variations:
chiet tach » chieu sach
dung cong » dung trong
ho chiet » ho chieu, ho thiet, hoc thiet
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh
anh ban » anh bang, anh bai, anh van
ban su » ban sua, dan su, van su

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 - anh ban su dung cong ((dan toan) or (van toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho chiet tach - anh ban su dung cong ((dan toan) OR (van toan)) cau*.