Perhaps you should try some spelling variations:
de literatura » de litterature, la literatura, y literatura
die filosofia » di filosofia, de filosofia, da filosofia
e filosofia » la filosofia
text das » text des, text der, text die

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: ((text das) OR (text data)) studium ((die filosofia) OR (e filosofia)) de literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((text das) OR (text data)) studium ((die filosofia) or (e filosofia)) de literatura".
• Adding a wildcard symbol may retrieve word variants: ((text das) OR (text data)) studium ((die filosofia) or (e filosofia)) de literatura*.