Perhaps you should try some spelling variations:
"morgan kaufmann heiner in data mangement systems" » "morgan kaufmann heiner in data management systems", "morgan kaufmann heiner in data management system's", "morgan kaufmann heiner in data managements systems", "morgan kaufmann seiner in data mangement systems", "morgan kaufmann heinz in data mangement systems", "morgan kaufmann heiner in data arrangement systems", "morgan kaufmann heiner in data movement systems"
"morgan kaufmann peter in data mangement systems" » "morgan kaufmann peter in data management systems", "morgan kaufmann peter in data management system's", "morgan kaufmann peter in data managements systems", "morgan kaufmann peter in data arrangement systems", "morgan kaufmann peter in data movement systems", "morgan hofmann peter in data mangement systems", "morgan kaufmann walther in data mangement systems"
"morgan kaufmann oder in data managment systems" » "morgan kaufmann oder in data management systems", "morgan kaufmann oder in data managment system", "morgan kaufmann oder in data managment systeme", "morgan kaufmann oder in data managing systems", "morgan kaufmann oder in data manager systems"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("morgan kaufmann heiner in data mangement systems") OR ("morgan kaufmann peter in data mangement systems"))) OR ("morgan kaufmann oder in data managment systems")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"morgan kaufmann heiner in data mangement systems\") OR (\"morgan kaufmann peter in data mangement systems\"))) or (\"morgan kaufmann oder in data managment systems\"))".
• Removing quotes may allow a broader search: (((( morgan kaufmann heiner in data mangement systems ) OR ( morgan kaufmann peter in data mangement systems ))) or ( morgan kaufmann oder in data managment systems )).
• Adding a wildcard symbol may retrieve word variants: (((("morgan kaufmann heiner in data mangement systems") OR ("morgan kaufmann peter in data mangement systems"))) or ("morgan kaufmann oder in data managment systems"))*.