Perhaps you should try some spelling variations:
a literatura » la literatura, a literature, y literatura
filosofia a » filosofia da, filosofia la, filosofia e
tests data » test data, lists data, testing data
studium 1 » studium _, studium 3, studium im
studium 8 » studium _, studium 3, studium im

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "tests data ((studium 1) OR (studium 8)) filosofia a literatura".
• Adding a wildcard symbol may retrieve word variants: tests data ((studium 1) OR (studium 8)) filosofia a literatura*.