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