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 hung dung trong marketing", "bo sach ky thuat xung dung trong marketing", "co sach ky thuat ung dung trong marketing", "hoc sach ky thuat ung dung trong marketing", "bo sach kmy thuat ung dung trong marketing", "bo sach kkxy thuat ung dung trong marketing", "bo sach kki thuat ung dung trong marketing", "bo sac ky thuat ung dung trong marketing", "bo sach ty thuat ung dung trong marketing", "bo sach kem thuat ung dung trong marketing"
"bo sach y thuat ung dung tvqg marketing" » "bo sach y thuat ung dung tri marketing", "bo sach y thuat dung dung tvqg marketing", "bo sach y thuat hung dung tvqg marketing", "bo sach y thuat xung dung tvqg marketing", "bo sach y thuat ung dung tong marketing", "co sach y thuat ung dung tvqg marketing", "hoc sach y thuat ung dung tvqg marketing", "bo sach my thuat ung dung tvqg marketing", "bo sach kxy thuat ung dung tvqg marketing", "bo sach ki 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: (("bo sach y thuat ung dung tvqg marketing") or ("bo sach ky thuat ung dung trong marketing"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("bo sach y thuat ung dung tvqg marketing") OR ("bo sach ky thuat ung dung trong marketing")).
• Removing quotes may allow a broader search: (( bo sach y thuat ung dung tvqg marketing ) or ( bo sach ky thuat ung dung trong marketing )).
• Adding a wildcard symbol may retrieve word variants: (("bo sach y thuat ung dung tvqg marketing") or ("bo sach ky thuat ung dung trong marketing"))*.