Perhaps you should try some spelling variations:
"hoc sach ky thuat song dung trong marketing" » "hoc sach ky thuat song dung tri marketing", "hoc sach ky thuat song duong trong marketing", "hoc sach ky thuat cong dung trong marketing", "hoc sach ky thuat song dong trong marketing", "hoc sinh ky thuat song dung trong marketing", "hoc cac ky thuat song dung trong marketing", "hoc anh ky thuat song dung trong marketing", "hoc sach kmy thuat song dung trong marketing", "hoc sach kkxy thuat song dung trong marketing", "hoc sach kki thuat song dung trong marketing", "hoc sac ky thuat song dung trong marketing", "hoc sach ty thuat song dung trong marketing", "hoc sach kem thuat song dung trong marketing"
"bo sach y thuat xung dung tvqg marketing" » "bo sach y thuat xung dung tri marketing", "bo sach y thuat dung dung tvqg marketing", "bo sach y thuat hung dung tvqg marketing", "bo sach y thuat ung dung tvqg marketing", "bo sach y thuat cung dung tvqg marketing", "bo sach y thuat xung dung tong marketing", "co sach y thuat xung dung tvqg marketing", "bo sach my thuat xung dung tvqg marketing", "bo sach kxy thuat xung dung tvqg marketing", "bo sach ki thuat xung dung tvqg marketing"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("bo sach y thuat xung dung tvqg marketing") OR ("hoc sach ky thuat song dung trong marketing"))~.
• Removing quotes may allow a broader search: (( bo sach y thuat xung dung tvqg marketing ) or ( hoc sach ky thuat song dung trong marketing ))~.
• Adding a wildcard symbol may retrieve word variants: (("bo sach y thuat xung dung tvqg marketing") or ("hoc sach ky thuat song dung trong marketing"))*.