Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
dung cong » dung trong
khan than » phan than, khoan thanh, khanh thanh
cao sach » co sach, ao sach, cau sach
anh dung » anh dong, anh huong, sach dung
cho dung » cho dong, cho ung, cao dung
cho cao » cho cac, cho dao, cho can

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

• Performing a fuzzy search may retrieve terms with similar spellings: cho cao sach - anh dung cho dung cong ((khan than) or (thanh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: cho cao sach - anh dung cho dung cong ((khan than) OR (thanh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: cho cao sach - anh dung cho dung cong ((khan than) or (thanh toan)) cau*.