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