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