Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
des filosofia » de filosofia, e filosofia, di filosofia
den studium » dein studium, dem studium, des studium
studium des » studium der
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 den studium des filosofia ((y literatura) OR (la literatura))*".