Perhaps you should try some spelling variations:
"bo sach dau thuan ung dung trong marketing" » "bo sach dau thuan ung dung tri marketing", "bo sach dau thuan ung dung tvqg marketing", "bo sach mau thuan ung dung trong marketing", "bo sach dau thuong ung dung trong marketing", "bo sach dau thau ung dung trong marketing", "bo sach dau thuat ung dung trong marketing", "bo sach dau thuat hung dung trong marketing", "bo sach dau thuat xung dung trong marketing", "bo sach dao thuan ung dung trong marketing", "bo sach dat thuan ung dung trong marketing", "co sach dau thuan ung dung trong marketing", "hoc sach dau thuan ung dung trong marketing"
"bo bach mai thuat dung dung tai marketing" » "bo bach mai thuat dung dung tri marketing", "bo bach mai thuat dung dung tac marketing", "bo bach mai thuat dung dung thi marketing", "bo bach mai thuat hung dung tai marketing", "bo bach mai thuat ung dung tai marketing", "bo bach mai thuat xung dung tai marketing", "bo bach mi thuat dung dung tai marketing", "bo bach ma thuat dung dung tai marketing", "bo bach giai thuat dung dung tai marketing", "bo bach mai thuat dung ung tai marketing", "bo bach mai thuat dung dong tai marketing", "bo bach mai thuat dang dung tai marketing", "bo trach mai thuat dung dung tai marketing", "noi bach mai thuat dung dung tai marketing"

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: (("bo sach dau thuan ung dung trong marketing") OR ("bo bach mai thuat dung dung tai marketing"))~.
• Removing quotes may allow a broader search: (( bo sach dau thuan ung dung trong marketing ) or ( bo bach mai thuat dung dung tai marketing ))~.
• Adding a wildcard symbol may retrieve word variants: (("bo sach dau thuan ung dung trong marketing") or ("bo bach mai thuat dung dung tai marketing"))*.