Perhaps you should try some spelling variations:
de literatura » de litterature, la literatura, y literatura
e literatura » y literatura, e literatur, a literatura
texten das » texten des, texten der, text das
studium la » studium a, studium als, studium das

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: texten das studium la filosofia ((de literatura) OR (e literatura))*.