Perhaps you should try some spelling variations:
"bo sac ky thuat ung dung cong marketing" » "bo sac ky thuat ung dung dong marketing", "bo sac ky thuat ung dung trong marketing", "bo sac ky thuat ung dung cuu marketing", "bo sac ky thuat dung dung cong marketing", "bo sac ky thuat hung dung cong marketing", "bo sac ky thuat xung dung cong marketing", "bo cac ky thuat ung dung cong marketing", "bo sai ky thuat ung dung cong marketing"
"bo sach va thuc dung dung tai marketing" » "bo sach va thuc dung dung tri marketing", "bo sach va thuc dung dung tac marketing", "bo sach va thuc dung dung thi marketing", "bo sach va thuoc dung dung tai marketing", "bo sach va thuy dung dung tai marketing", "bo sach va tuc dung dung tai marketing", "bo sach va thuc dung ung tai marketing", "bo sach va thuc dung dong tai marketing", "bo sach va thuc dang dung tai marketing", "co sach va thuc dung dung tai marketing", "hoc sach va thuc dung dung tai marketing", "bo sach xa thuc dung dung tai marketing", "bo sach ha thuc dung dung tai marketing", "bo sach dao thuc dung 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 va thuc dung dung tai marketing") or ("bo sac ky thuat ung dung cong marketing"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("bo sach va thuc dung dung tai marketing") OR ("bo sac ky thuat ung dung cong marketing")).
• Removing quotes may allow a broader search: (( bo sach va thuc dung dung tai marketing ) or ( bo sac ky thuat ung dung cong marketing )).
• Adding a wildcard symbol may retrieve word variants: (("bo sach va thuc dung dung tai marketing") or ("bo sac ky thuat ung dung cong marketing"))*.