Perhaps you should try some spelling variations:
der filosofia » de filosofia, e filosofia, di filosofia
a literatura » la literatura, a literature, a literatur
y literatura » la literatura
testo das » test das, tests das, testen das

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: "testo das studium der filosofia ((a literatura) OR (y literatura))".
• Adding a wildcard symbol may retrieve word variants: testo das studium der filosofia ((a literatura) OR (y literatura))*.