Perhaps you should try some spelling variations:
thu thanh » thu thang, tu thanh, thuan thanh
ban thanh » ban hanh, ban hang
thanh cao » thanh ca, thanh cac, thanh thao
cua dung » cua dang, qua dung, cua rung
cua dong » chua dong, cua cong, cua dang
cong ban » cong bang, cong san, cong tan
hoc thu » hoc thuc, hoc thuy, hoc tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thu thanh - canh tranh ((cua dung) or (cua dong)) cong ban thanh cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thu thanh - canh tranh ((cua dung) OR (cua dong)) cong ban thanh cao.
• Adding a wildcard symbol may retrieve word variants: hoc thu thanh - canh tranh ((cua dung) or (cua dong)) cong ban thanh cao*.