Perhaps you should try some spelling variations:
"co sach ky thuat xung dung trong marketing" » "co sach ky thuat xung dung tri marketing", "co sach ky thuat xung dung tvqg marketing", "co sach ky thuat dung dung trong marketing", "co sach ky thuat hung dung trong marketing", "co sach ky thuat ung dung trong marketing", "co sach ky thuat cung dung trong marketing", "bo sach ky thuat xung dung trong marketing", "cuon sach ky thuat xung dung trong marketing", "hoc sach ky thuat xung dung trong marketing", "co sac ky thuat xung dung trong marketing", "co sach y thuat xung dung trong marketing", "co sach ty thuat xung dung trong marketing"
"co chu ky thuat chuong dung tren marketing" » "co chu ky thuat chuong dung trinh marketing", "co chu ky thuat chuong dung thien marketing", "co chu ky thuat chuong dung tri marketing", "co chu ky thuat cong dung tren marketing", "co chu ky thuat hung dung tren marketing", "co chu ky thuat song dung tren marketing", "co chu ky thuat chuong duong tren marketing", "co chu ky thuat cuong dung tren marketing", "co chu ky thuat phuong dung tren marketing", "co chu ky thuat chuong dung trung marketing", "cho chu ky thuat chuong dung tren marketing", "cao chu ky thuat chuong dung tren marketing", "co che ky thuat chuong dung tren 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 xung dung trong marketing") OR ("co chu ky thuat chuong dung tren marketing"))~.
• Removing quotes may allow a broader search: (( co sach ky thuat xung dung trong marketing ) or ( co chu ky thuat chuong dung tren marketing ))~.
• Adding a wildcard symbol may retrieve word variants: (("co sach ky thuat xung dung trong marketing") or ("co chu ky thuat chuong dung tren marketing"))*.