Perhaps you should try some spelling variations:
y literatura » la literatura
di filosofia » la filosofia, e filosofia
a filosofia » la filosofia, e filosofia
besten der » bestimmen der, bestehens der, bestehen des

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