Perhaps you should try some spelling variations:
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"bo sach ki thuat hung dung sai marketing" » "bo sach ki thuat hung dung tri marketing", "bo sach ki thuat hung dung tac marketing", "bo sach ki thuat hung dung van marketing", "bo sach ki thuat ung dung sai marketing", "bo sach ki thuat xung dung sai marketing", "bo sach ki thuat chuong dung sai marketing", "bo sach ki thuat nhung dung sai marketing", "bo sach ki thuat phung dung sai marketing", "bo sach ki thuat hung dung tai marketing", "bo sach ki thuat hung dung va marketing", "bo sach ki thuat hung dung dat marketing", "co sach ki thuat hung dung sai marketing", "bo sach kinh thuat hung dung sai marketing", "bo sach bai thuat hung dung sai marketing", "bo sach kem thuat hung dung sai 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 ki thuat hung dung sai marketing") or ("hoc sach ky thuat dung dung tvqg marketing"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("bo sach ki thuat hung dung sai marketing") OR ("hoc sach ky thuat dung dung tvqg marketing"))*.
• Removing quotes may allow a broader search: (( bo sach ki thuat hung dung sai marketing ) or ( hoc sach ky thuat dung dung tvqg marketing ))*.