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

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