Perhaps you should try some spelling variations:
e literatura » de literatura, y literatura, a literatura
studium la » studium a, studium als, studium das
tests das » tests des, test das, tests data
literatura » literaturea
literatur » literature

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: "tests das studium la filosofia ((e literatura) OR (e literatur))".
• Adding a wildcard symbol may retrieve word variants: tests das studium la filosofia ((e literatura) OR (e literatur))*.