Perhaps you should try some spelling variations:
chiet tach » chieu sach
thanh tung » thanh cong
so chiet » so thiet, soc thiet, so viet
tam hung » tam huong, cam hung, ham hung
tai hung » mai hung, tai phuong, tai thuong
bai than » ban than, bay than, tai thanh
bai toan » bai tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: so chiet tach - thanh tung ((tam hung) or (tai hung)) cuong ((bai than) or (bai toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so chiet tach - thanh tung ((tam hung) OR (tai hung)) cuong ((bai than) OR (bai toan)) cau.
• Adding a wildcard symbol may retrieve word variants: so chiet tach - thanh tung ((tam hung) or (tai hung)) cuong ((bai than) or (bai toan)) cau*.