Perhaps you should try some spelling variations:
"co sach ky thuat ung dung trong marketing" » "co sach ky thuat ung dung tri marketing", "co sach ky thuat dung dung trong marketing", "co sach ky thuat hung dung trong marketing", "co sach ky thuat song dung trong marketing", "bo sach ky thuat ung dung trong marketing", "cuon sach ky thuat ung dung trong marketing", "hoc sach ky thuat ung dung trong marketing", "co sac ky thuat ung dung trong marketing", "co sach y thuat ung dung trong marketing", "co sach ty thuat ung dung trong marketing"
"co sach my thuat xung dung tvqg marketing" » "co sach my thuat xung dung tri marketing", "co sach my thuat dung dung tvqg marketing", "co sach my thuat hung dung tvqg marketing", "co sach my thuat song dung tvqg marketing", "co sach my thuat cung dung tvqg marketing", "co sach my thuat cuong dung tvqg marketing", "co sach my thuat xung dung tong marketing", "co sach ki thuat xung dung tvqg marketing", "co sach va thuat xung dung tvqg marketing", "bo sach my thuat xung dung tvqg marketing", "cuon sach my thuat xung dung tvqg marketing", "hoc sach my thuat xung dung tvqg marketing", "co sach y thuat xung dung tvqg marketing", "co sach ty thuat xung dung tvqg marketing", "co sach mau thuat xung dung tvqg 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 ung dung trong marketing") or ("co sach my thuat xung dung tvqg marketing"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("co sach ky thuat ung dung trong marketing") OR ("co sach my thuat xung dung tvqg marketing")).
• Removing quotes may allow a broader search: (( co sach ky thuat ung dung trong marketing ) or ( co sach my thuat xung dung tvqg marketing )).
• Adding a wildcard symbol may retrieve word variants: (("co sach ky thuat ung dung trong marketing") or ("co sach my thuat xung dung tvqg marketing"))*.