Perhaps you should try some spelling variations:
"co sach ky thuat nhung dung trong marketing" » "co sach ky thuat nhung dung tvqg marketing", "co sach ky thuat hung dung trong marketing", "co sach ky thuat chung dung trong marketing", "co sach ky thuat chuong dung trong marketing", "co sach ky thuat phuong dung trong marketing", "co sach ky thuat thong dung trong marketing", "co sach ky thuat trung dung trong marketing", "bo sach ky thuat nhung dung trong marketing", "cuon sach ky thuat nhung dung trong marketing", "hoc sach ky thuat nhung dung trong marketing", "co sac ky thuat nhung dung trong marketing", "co sach y thuat nhung dung trong marketing", "co sach ty thuat nhung dung trong marketing"
"co cau ky thuat ung dung tri marketing" » "co cau ky thuat ung dung tvqg marketing", "co cau ky thuat ung dung _ marketing", "co cau ky thuat ung dung cuu marketing", "co cau ky thuat dung dung tri marketing", "co cau ky thuat hung dung tri marketing", "co cau ky thuat xung dung tri marketing", "co cau ky thuat ung dung tai marketing", "co cau ky thuat ung dung tren marketing", "co cau ky thuat ung dung sai marketing", "bo cau ky thuat ung dung tri marketing", "co cao ky thuat ung dung tri marketing", "co cac ky thuat ung dung tri marketing", "co chu ky thuat ung dung tri 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 nhung dung trong marketing") OR ("co cau ky thuat ung dung tri marketing"))~.
• Removing quotes may allow a broader search: (( co sach ky thuat nhung dung trong marketing ) or ( co cau ky thuat ung dung tri marketing ))~.
• Adding a wildcard symbol may retrieve word variants: (("co sach ky thuat nhung dung trong marketing") or ("co cau ky thuat ung dung tri marketing"))*.