Perhaps you should try some spelling variations:
filosofica a » filosofica da, filosofica e, filosofica _
a literatura » la literatura, a literature, y literatura
studium des » studium der
des dualen » der dualen, des idealen
studium ds » studium das, studium d, studium der

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) OR (studium des)) filosofica a literatura".
• Adding a wildcard symbol may retrieve word variants: des dualen ((studium ds) OR (studium des)) filosofica a literatura*.