Perhaps you should try some spelling variations:
"und geisteswissenschaften" » "andere geisteswissenschaften", "2012 geisteswissenschaften", "geisteswissenschaften 6"
"der geisteswissenschaften" » "andere geisteswissenschaften", "2012 geisteswissenschaften", "geisteswissenschaften 6"

Try widening your search to All Fields.

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"und geisteswissenschaften\") OR (\"der geisteswissenschaften\"))".
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• Adding a wildcard symbol may retrieve word variants: (("und geisteswissenschaften") OR ("der geisteswissenschaften"))*.