Perhaps you should try some spelling variations:
de literatura » de litterature, la literatura, y literatura
filosofia de » filosofia del
text dem » text der, text des, text deep
text den » text der, text des, text daten

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: "((text dem) OR (text den)) studium _ filosofia de literatura".
• Adding a wildcard symbol may retrieve word variants: ((text dem) OR (text den)) studium _ filosofia de literatura*.