Perhaps you should try some spelling variations:
dualen studium » duales studium, duale studium
filosofia la » filosofia da, filosofia le, filosofica da
filosofia a » filosofia da, filosofia e, filosofia _
des dualen » der dualen, des idealen
studium a » studium am, studium ad, studium _

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "des dualen studium a ((filosofia a) OR (filosofia la)) literature".
• Adding a wildcard symbol may retrieve word variants: des dualen studium a ((filosofia a) OR (filosofia la)) literature*.