Perhaps you should try some spelling variations:
"co sach ky thuat cuong dung trong marketing" » "co sach ky thuat cuong dung tri marketing", "co sach ky thuat cuong dung tvqg marketing", "co sach ky thuat chuong dung trong marketing", "co sach ky thuat cong dung trong marketing", "co sach ky thuat tuong dung trong marketing", "co sach ky thuat tuong duong trong marketing", "co sach ky thuat thong dung trong marketing", "bo sach ky thuat cuong dung trong marketing", "cuon sach ky thuat cuong dung trong marketing", "hoc sach ky thuat cuong dung trong marketing", "co sac ky thuat cuong dung trong marketing", "co sach y thuat cuong dung trong marketing", "co sach ty thuat cuong dung trong marketing"
"co chu ky thuat ung dung tren marketing" » "co chu ky thuat ung dung trinh marketing", "co chu ky thuat ung dung thien marketing", "co chu ky thuat ung dung tri marketing", "co chu ky thuat dung dung tren marketing", "co chu ky thuat hung dung tren marketing", "co chu ky thuat xung dung tren marketing", "co chu ky thuat ung dung trung marketing", "cho chu ky thuat ung dung tren marketing", "cao chu ky thuat ung dung tren marketing", "co che ky thuat ung dung tren marketing"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("co sach ky thuat cuong dung trong marketing") or ("co chu ky thuat ung dung tren marketing"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("co sach ky thuat cuong dung trong marketing") OR ("co chu ky thuat ung dung tren marketing")).
• Removing quotes may allow a broader search: (( co sach ky thuat cuong dung trong marketing ) or ( co chu ky thuat ung dung tren marketing )).
• Adding a wildcard symbol may retrieve word variants: (("co sach ky thuat cuong dung trong marketing") or ("co chu ky thuat ung dung tren marketing"))*.