Perhaps you should try some spelling variations:
das filosofia » da filosofia, la filosofia, di filosofia
studium das » studium des, studium der, studium die
test de » test der, test des, est de
test d » test do, test der, test 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: ((test d) OR (test de)) studium das filosofia _ literatura.
• Adding a wildcard symbol may retrieve word variants: ((test d) or (test de)) studium das filosofia _ literatura*.