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