Perhaps you should try some spelling variations:
thanh thang » nhanh thang, thanh thanh, thanh hang
bien tinh » bi tinh, yen tinh, diep tinh
dong toan » dung toan, bong toan, cong toan
cua hang » cua nhung, cua cong, cua ban
cua dang » cua cong, cua ban
toan ban » van ban
so bien » mot bien

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so bien tinh - thanh thang ((cua hang) OR (cua dang)) cong dong toan ban~.
• Adding a wildcard symbol may retrieve word variants: so bien tinh - thanh thang ((cua hang) or (cua dang)) cong dong toan ban*.