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