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