Perhaps you should try some spelling variations:
"co sach ky thuat ung dung trong marketing" » "co sach ky thuat ung dung tri marketing", "co sach ky thuat dung dung trong marketing", "co sach ky thuat xung dung trong marketing", "co sach ky thuat song dung trong marketing", "cuon sach ky thuat ung dung trong marketing", "hoc sach ky thuat ung dung trong marketing", "co sac ky thuat ung dung trong marketing", "co sach y thuat ung dung trong marketing", "co sach ty thuat ung dung trong marketing"
"bo sach kem thuat hung dung tvqg marketing" » "bo sach kem thuat hung dung tri marketing", "bo sach kem thuat dung dung tvqg marketing", "bo sach kem thuat xung dung tvqg marketing", "bo sach kem thuat chuong dung tvqg marketing", "bo sach kiem thuat hung dung tvqg marketing", "bo sach ki thuat hung dung tvqg marketing", "bo sach ve thuat hung dung tvqg marketing", "bo sach kem thuat nhung dung tvqg marketing", "bo sach kem thuat phung dung tvqg marketing", "bo sach kem thuat hung dung tong marketing", "bo hanh kem thuat hung dung tvqg marketing", "hoc sach kem thuat hung dung tvqg 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 ky thuat ung dung trong marketing") OR ("bo sach kem thuat hung dung tvqg marketing"))~.
• Removing quotes may allow a broader search: (( co sach ky thuat ung dung trong marketing ) or ( bo sach kem thuat hung dung tvqg marketing ))~.
• Adding a wildcard symbol may retrieve word variants: (("co sach ky thuat ung dung trong marketing") or ("bo sach kem thuat hung dung tvqg marketing"))*.