Perhaps you should try some spelling variations:
da literatura » la literatura, a literatura, de literatura
data studium » das studium, data studies, data studio
e filosofia » la filosofia
y filosofia » a filosofia, la filosofia, di filosofia
test » text

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 data studium ((e filosofia) OR (y filosofia)) da literatura.
• Adding a wildcard symbol may retrieve word variants: test data studium ((e filosofia) or (y filosofia)) da literatura*.