Perhaps you should try some spelling variations:
"bo sach my thuat nhung dung trinh marketing" » "bo sach my thuat nhung dung tri marketing", "bo sach my thuat nhung dung trong marketing", "bo sach my thuat hung dung trinh marketing", "bo sach my thuat chung dung trinh marketing", "bo sach my thuat chuong dung trinh marketing", "bo sach my thuat phuong dung trinh marketing", "bo sach my thuat ung dung trinh marketing", "bo sach my thuat thong dung trinh marketing", "bo sach my thuat nhung dung tinh marketing", "bo sach my thuat nhung dong trinh marketing", "bo sach my thuat nhung dung trich marketing", "bo sach ky thuat nhung dung trinh marketing", "bo sach ki thuat nhung dung trinh marketing", "bo sach va thuat nhung dung trinh marketing", "co sach my thuat nhung dung trinh marketing", "bo sach y thuat nhung dung trinh marketing", "bo sach ty thuat nhung dung trinh marketing", "bo sach mau thuat nhung dung trinh marketing"
"hoc sach my thuat xung dung tai marketing" » "hoc sach my thuat xung dung tri marketing", "hoc sach my thuat xung dung tac marketing", "hoc sach my thuat xung dung thi marketing", "hoc sach my thuat dung dung tai marketing", "hoc sach my thuat hung dung tai marketing", "hoc sach my thuat ung dung tai marketing", "hoc sach my thuat cung dung tai marketing", "hoc sach ky thuat xung dung tai marketing", "hoc sach ki thuat xung dung tai marketing", "hoc sach va thuat xung dung tai marketing", "hoc sinh my thuat xung dung tai marketing", "hoc cac my thuat xung dung tai marketing", "hoc anh my thuat xung dung tai marketing", "hoc sach y thuat xung dung tai marketing", "hoc sach ty thuat xung dung tai marketing", "hoc sach mau thuat xung dung tai 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 nhung dung trinh marketing") or ("hoc sach my thuat xung dung tai marketing"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("bo sach my thuat nhung dung trinh marketing") OR ("hoc sach my thuat xung dung tai marketing")).
• Removing quotes may allow a broader search: (( bo sach my thuat nhung dung trinh marketing ) or ( hoc sach my thuat xung dung tai marketing )).
• Adding a wildcard symbol may retrieve word variants: (("bo sach my thuat nhung dung trinh marketing") or ("hoc sach my thuat xung dung tai marketing"))*.