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