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

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