Perhaps you should try some spelling variations:
da literatura » la literatura, a literatura, de literatura
data studium » das studium, data studies, data studied
filosofia da » filosofia de, filosofia del, filosofia e
data studio » data studies
i filosofia » di filosofia, e filosofia, a filosofia

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) OR (((data studio) OR (data study)))) i filosofia da literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tests ((data studium) or (((data studio) OR (data study)))) i filosofia da literatura".
• Adding a wildcard symbol may retrieve word variants: tests ((data studium) or (((data studio) OR (data study)))) i filosofia da literatura*.