Perhaps you should try some spelling variations:
"co sach do dinh ung dung sai marketing" » "co sach do dinh ung dung tri marketing", "co sach do dinh ung dung tac marketing", "co sach do dinh ung dung van marketing", "co sach do dinh hung dung sai marketing", "co sach do dinh dung dung sai marketing", "co sach do dinh sung dung sai marketing", "co sach do dinh ung dung tai marketing", "co sach do dinh ung dung va marketing", "co sach do dinh ung dung dat marketing", "cuon sach do dinh ung dung sai marketing", "hoc sach do dinh ung dung sai marketing", "co sach dao dinh ung dung sai marketing", "co sach doi dinh ung dung sai marketing", "co sach de dinh ung dung sai marketing"
"bo sach ky thuat ung dung doi marketing" » "bo sach ky thuat ung dung dong marketing", "bo sach ky thuat ung dung tri marketing", "bo sach ky thuat ung dung thi marketing", "bo sach ky thuat dung dung doi marketing", "bo sach ky thuat hung dung doi marketing", "bo sach ky thuat xung dung doi marketing", "bo sach ky thuat ung huong doi marketing", "bo sach ky thuat ung dung tai marketing", "bo sach ky thuat ung dung co marketing", "hoc sach ky thuat ung dung doi marketing", "bo sac ky thuat ung dung doi marketing", "bo sach y thuat ung dung doi marketing", "bo sach ty thuat ung dung doi 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: (("co sach do dinh ung dung sai marketing") OR ("bo sach ky thuat ung dung doi marketing"))~.
• Removing quotes may allow a broader search: (( co sach do dinh ung dung sai marketing ) or ( bo sach ky thuat ung dung doi marketing ))~.
• Adding a wildcard symbol may retrieve word variants: (("co sach do dinh ung dung sai marketing") or ("bo sach ky thuat ung dung doi marketing"))*.