Perhaps you should try some spelling variations:
"co sach y thuat ung dung tvqg marketing" » "co sach y thuat ung dung trong marketing", "co sach y thuat ung dung tri marketing", "co sach y thuat dung dung tvqg marketing", "co sach y thuat hung dung tvqg marketing", "co sach y thuat xung dung tvqg marketing", "co sach y thuat ung dung tong marketing", "bo sach y thuat ung dung tvqg marketing", "cuon sach y thuat ung dung tvqg marketing", "hoc sach y thuat ung dung tvqg marketing", "co sach ky thuat ung dung tvqg marketing", "co sach my thuat ung dung tvqg marketing", "co sach kxy thuat ung dung tvqg marketing"
"nuoc sach ki thuat ung dung tai marketing" » "nuoc sach ki thuat ung dung tri marketing", "nuoc sach ki thuat ung dung tac marketing", "nuoc sach ki thuat ung dung thi marketing", "nuoc sach ki thuat dung dung tai marketing", "nuoc sach ki thuat hung dung tai marketing", "nuoc sach ki thuat xung dung tai marketing", "nguoi sach ki thuat ung dung tai marketing", "hoc sach ki thuat ung dung tai marketing", "cuoc cach ki thuat ung dung tai marketing", "nuoc sach ky thuat ung dung tai marketing", "nuoc sach kinh thuat ung dung tai marketing", "nuoc sach bai thuat ung dung tai marketing", "nuoc sach kem thuat ung 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: (("co sach y thuat ung dung tvqg marketing") OR ("nuoc sach ki thuat ung dung tai marketing"))~.
• Removing quotes may allow a broader search: (( co sach y thuat ung dung tvqg marketing ) or ( nuoc sach ki thuat ung dung tai marketing ))~.
• Adding a wildcard symbol may retrieve word variants: (("co sach y thuat ung dung tvqg marketing") or ("nuoc sach ki thuat ung dung tai marketing"))*.