Perhaps you should try some spelling variations:
y filosofica » y filosofia, e filosofica, y filosofico
filosofica a » filosofica da, filosofica e, filosofica _
a literatura » la literatura, a literature, y literatura
texten das » texten des, texten der, texten aus
studium y » studium _, studium 1, studium 3
text das » text des, text data, text der

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) OR (text das)) studium y filosofica a literatura*.