Perhaps you should try some spelling variations:
a literatura » la literatura, a literature, y literatura
filosofia a » filosofia da, filosofia la, filosofia e
des dualen » der dualen, des idealen
studium di » studium die, studium i, studium d
studium ii » studium im, studium i, studium die

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