Perhaps you should try some spelling variations:
"bo sach ky thuat ung dung trong marketing" » "bo sach ky thuat ung dung tri marketing", "bo sach ky thuat dung dung trong marketing", "bo sach ky thuat xung dung trong marketing", "bo sach ky thuat song dung trong marketing", "co sach ky thuat ung dung trong marketing", "hoc sach ky thuat ung dung trong marketing", "bo sac ky thuat ung dung trong marketing", "bo sach y thuat ung dung trong marketing", "bo sach ty thuat ung dung trong marketing"
"cuon sach ki thuat hung dung tvqg marketing" » "cuon sach ki thuat hung dung tri marketing", "cuon sach ki thuat dung dung tvqg marketing", "cuon sach ki thuat xung dung tvqg marketing", "cuon sach ki thuat chuong dung tvqg marketing", "duong sach ki thuat hung dung tvqg marketing", "cuoc cach ki thuat hung dung tvqg marketing", "co sach ki thuat hung dung tvqg marketing", "cuon sach ki thuat nhung dung tvqg marketing", "cuon sach ki thuat phung dung tvqg marketing", "cuon sach ki thuat hung dung tong marketing", "cuon sach kinh thuat hung dung tvqg marketing", "cuon sach bai thuat hung dung tvqg marketing", "cuon 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: (("bo sach ky thuat ung dung trong marketing") or ("cuon sach ki thuat hung dung tvqg marketing"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("bo sach ky thuat ung dung trong marketing") OR ("cuon sach ki thuat hung dung tvqg marketing"))*.
• Removing quotes may allow a broader search: (( bo sach ky thuat ung dung trong marketing ) or ( cuon sach ki thuat hung dung tvqg marketing ))*.