Perhaps you should try some spelling variations:
"hoc sach ki thuat song dung trong marketing" » "hoc sach ki thuat song dung tri marketing", "hoc sach ki thuat song dung tvqg marketing", "hoc sach ki thuat song duong trong marketing", "hoc sach ki thuat cong dung trong marketing", "hoc sach ki thuat song dong trong marketing", "hoc sinh ki thuat song dung trong marketing", "hoc cac ki thuat song dung trong marketing", "hoc anh ki thuat song dung trong marketing", "hoc sach ky thuat song dung trong marketing", "hoc sach kinh thuat song dung trong marketing", "hoc sach bai thuat song dung trong marketing", "hoc sach kem thuat song dung trong marketing"
"bo sach my thuat ung dung trong marketing" » "bo sach my thuat ung dung tri marketing", "bo sach my thuat ung dung tvqg marketing", "bo sach my thuat dung dung trong marketing", "bo sach my thuat hung dung trong marketing", "bo sach my thuat xung dung trong marketing", "bo sach ky thuat ung dung trong marketing", "bo sach va thuat ung dung trong marketing", "co sach my thuat ung dung trong marketing", "bo sach y thuat ung dung trong marketing", "bo sach ty thuat ung dung trong marketing", "bo sach mau thuat ung dung trong 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: (("hoc sach ki thuat song dung trong marketing") or ("bo sach my thuat ung dung trong marketing"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("hoc sach ki thuat song dung trong marketing") OR ("bo sach my thuat ung dung trong marketing")).
• Removing quotes may allow a broader search: (( hoc sach ki thuat song dung trong marketing ) or ( bo sach my thuat ung dung trong marketing )).
• Adding a wildcard symbol may retrieve word variants: (("hoc sach ki thuat song dung trong marketing") or ("bo sach my thuat ung dung trong marketing"))*.