Perhaps you should try some spelling variations:
duales studium » das studium
texts duales » neues duales, texts alex, texts cases
filosofia la » filosofia le, filosofica da, filosofia das
filosofia da » filosofia de, filosofia del, filosofia e
studium la » studium a, studium als, studium das

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: "texts duales studium la ((filosofia la) OR (filosofia da)) litterature".
• Adding a wildcard symbol may retrieve word variants: texts duales studium la ((filosofia la) OR (filosofia da)) litterature*.