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 xung 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 kem thuat ung dung trong marketing"
"co sach ty thuat ung dung tvqg marketing" » "co sach ty thuat ung dung tri marketing", "co sach ty thuat dung dung tvqg marketing", "co sach ty thuat hung dung tvqg marketing", "co sach ty thuat xung dung tvqg marketing", "co sach ty thuat ung dung tong marketing", "co sach my thuat ung dung tvqg marketing", "co sach te thuat ung dung tvqg marketing", "co sach thu thuat ung dung tvqg marketing", "bo sach ty thuat ung dung tvqg marketing", "cuon sach ty thuat ung dung tvqg marketing", "hoc sach ty thuat ung dung tvqg marketing", "co sach y thuat ung dung tvqg marketing", "co sach tu thuat ung 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 ty thuat ung 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 ty thuat ung dung tvqg marketing")).
• Removing quotes may allow a broader search: (( co sach ky thuat ung dung trong marketing ) or ( co sach ty thuat ung dung tvqg marketing )).
• Adding a wildcard symbol may retrieve word variants: (("co sach ky thuat ung dung trong marketing") or ("co sach ty thuat ung dung tvqg marketing"))*.