Perhaps you should try some spelling variations:
"bo sach ky thuat xung dung tren marketing" » "bo sach ky thuat xung dung trong marketing", "bo sach ky thuat xung dung trinh marketing", "bo sach ky thuat xung dung thien marketing", "bo sach ky thuat dung dung tren marketing", "bo sach ky thuat hung dung tren marketing", "bo sach ky thuat ung dung tren marketing", "bo sach ky thuat cung dung tren marketing", "bo sach ky thuat cuong dung tren marketing", "bo sach ky thuat xung dung trung marketing", "co sach ky thuat xung dung tren marketing", "hoc sach ky thuat xung dung tren marketing", "bo sac ky thuat xung dung tren marketing", "bo sach y thuat xung dung tren marketing", "bo sach ty thuat xung dung tren 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 ung dung tai marketing", "bo sach va thuc dung ung tai marketing", "bo sach va thuc dung dong 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"

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 sach ky thuat xung dung tren marketing"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("bo sach va thuc dung dung tai marketing") OR ("bo sach ky thuat xung dung tren marketing"))*.
• Removing quotes may allow a broader search: (( bo sach va thuc dung dung tai marketing ) or ( bo sach ky thuat xung dung tren marketing ))*.