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