Perhaps you should try some spelling variations:
thanh tung » thanh cong
thong cong » trong cong, tong cong, thong thong
tieu sach » chieu sach, dien sach, te sach
va thong » va thuong, va phuong, he thong
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan
tung va » trung va, tuong va, dung va

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu sach - thanh tung va thong cong ((dan than) or (van than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu sach - thanh tung va thong cong ((dan than) OR (van than)) cau.
• Adding a wildcard symbol may retrieve word variants: theo tieu sach - thanh tung va thong cong ((dan than) or (van than)) cau*.