Perhaps you should try some spelling variations:
dualen studium » duales studium, duale studium
filosofica da » filosofia da, filosofia de, filosofica e
filosofia di » filosofia de, filosofia da, filosofia del
des dualen » der dualen, des idealen
studium ds » studium des, studium das, studium d

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 ds ((filosofica da) OR (filosofia di)) literatura*".