Perhaps you should try some spelling variations:
"morgan kaufmann heinz in data management systems" » "morgan kaufmann heinz in data management system", "morgan kaufmann heinz in database management systems", "morgan kaufmann franz in data management systems"
"morgan kaufmann hans in data management systems" » "morgan kaufmann hans in data management system", "morgan kaufmann hans in database management systems", "morgan kaufmann als in data management systems", "morgan kaufmann und in data management systems"
"morgan kaufmann seiner in data managment systems" » "morgan kaufmann seiner in data managment system", "morgan kaufmann seiner in data managment systeme", "morgan kaufmann seiner in data management system's", "morgan kaufmann heiner in data managment systems", "morgan kaufmann peter in data managment systems", "morgan kaufmann seiner in data mangement systems", "morgan kaufmann seiner in data managing systems", "morgan kaufmann seiner in data manager systems"

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