Perhaps you should try some spelling variations:
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"bo sach ky thuat cong dung va marketing" » "bo sach ky thuat cong dung van marketing", "bo sach ky thuat cong dung tac marketing", "bo sach ky thuat cong dung gia marketing", "bo sach ky thuat song dung va marketing", "bo sach ky thuat trong dung va marketing", "bo sach ky thu cong dung va marketing", "bo sach ky thuat cuong dung va marketing", "bo sach ky thuat cong dong va marketing", "bo sach ky thuat cong luong va marketing", "co sach ky thuat cong dung va marketing", "hoc sach ky thuat cong dung va marketing", "bo sac ky thuat cong dung va marketing", "bo sach y thuat cong dung va marketing", "bo sach ty thuat cong dung va 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 ki thuat hung dong tvqg marketing") or ("bo sach ky thuat cong dung va marketing"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("bo sach ki thuat hung dong tvqg marketing") OR ("bo sach ky thuat cong dung va marketing")).
• Removing quotes may allow a broader search: (( bo sach ki thuat hung dong tvqg marketing ) or ( bo sach ky thuat cong dung va marketing )).
• Adding a wildcard symbol may retrieve word variants: (("bo sach ki thuat hung dong tvqg marketing") or ("bo sach ky thuat cong dung va marketing"))*.