Perhaps you should try some spelling variations:
e literatura » de literatura, e literatur, a literatura
y literatura » la literatura
die studies » diet studies, die studien, adme studies
y filosofia » e filosofia, a filosofia, la filosofia
die studie » eine studie

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: test ((die studie) OR (die studies)) y filosofia ((e literatura) OR (y literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "test ((die studie) or (die studies)) y filosofia ((e literatura) OR (y literatura))".
• Adding a wildcard symbol may retrieve word variants: test ((die studie) or (die studies)) y filosofia ((e literatura) OR (y literatura))*.