Perhaps you should try some spelling variations:
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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 va thuc dung dong van marketing") or ("bo sac ky thuat ung dung tong marketing"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("bo sach va thuc dung dong van marketing") OR ("bo sac ky thuat ung dung tong marketing")).
• Removing quotes may allow a broader search: (( bo sach va thuc dung dong van marketing ) or ( bo sac ky thuat ung dung tong marketing )).
• Adding a wildcard symbol may retrieve word variants: (("bo sach va thuc dung dong van marketing") or ("bo sac ky thuat ung dung tong marketing"))*.