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 ung dung tvqg 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 ty thuat ung dung trong marketing"
"co sach my thuat cung dung trong marketing" » "co sach my thuat cung dung tri marketing", "co sach my thuat cung dung tvqg marketing", "co sach my thuat chung dung trong marketing", "co sach my thuat cong dung trong marketing", "co sach my thuat dung dung trong marketing", "co sach my thuat cuong dung trong marketing", "co sach my thuat cung ung trong marketing", "co sach ki thuat cung dung trong marketing", "co sach va thuat cung dung trong marketing", "bo sach my thuat cung dung trong marketing", "cuon sach my thuat cung dung trong marketing", "hoc sach my thuat cung dung trong marketing", "co sach y thuat cung dung trong marketing", "co sach ty thuat cung dung trong marketing", "co sach mau thuat cung dung trong marketing"

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 cung dung trong 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 cung dung trong marketing")).
• Removing quotes may allow a broader search: (( co sach ky thuat ung dung trong marketing ) or ( co sach my thuat cung dung trong marketing )).
• Adding a wildcard symbol may retrieve word variants: (("co sach ky thuat ung dung trong marketing") or ("co sach my thuat cung dung trong marketing"))*.