Perhaps you should try some spelling variations:
"bo sach ma thuat ung dung tren marketing" » "bo sach ma thuat ung dung trong marketing", "bo sach ma thuat ung dung trinh marketing", "bo sach ma thuat ung dung thien marketing", "bo sach ma thuat dung dung tren marketing", "bo sach ma thuat hung dung tren marketing", "bo sach ma thuat xung dung tren marketing", "bo sach ma thuat ung dung trung marketing", "bo sach my thuat ung dung tren marketing", "bo sach va thuat ung dung tren marketing", "bo sach mi thuat ung dung tren marketing", "co sach ma thuat ung dung tren marketing", "hoc sach ma thuat ung dung tren marketing", "bo sach mau thuat ung dung tren marketing", "bo sach xa thuat ung dung tren marketing", "bo sach ha thuat ung dung tren marketing"
"bo sac ky thuat ung dung doi marketing" » "bo sac ky thuat ung dung dong marketing", "bo sac ky thuat ung dung tri marketing", "bo sac ky thuat ung dung thi marketing", "bo sac ky thuat dung dung doi marketing", "bo sac ky thuat hung dung doi marketing", "bo sac ky thuat xung dung doi marketing", "bo sac ky thuat ung huong doi marketing", "bo sac ky thuat ung dung tai marketing", "bo sac ky thuat ung dung co marketing", "bo cac ky thuat ung dung doi marketing", "bo sai ky thuat ung dung doi marketing"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("bo sac ky thuat ung dung doi marketing") or ("bo sach ma thuat ung dung tren marketing"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("bo sac ky thuat ung dung doi marketing") OR ("bo sach ma thuat ung dung tren marketing")).
• Removing quotes may allow a broader search: (( bo sac ky thuat ung dung doi marketing ) or ( bo sach ma thuat ung dung tren marketing )).
• Adding a wildcard symbol may retrieve word variants: (("bo sac ky thuat ung dung doi marketing") or ("bo sach ma thuat ung dung tren marketing"))*.