Perhaps you should try some spelling variations:
de filosofica » de filosofia, e filosofica, e filosofia
tests easier » gets easier, tasks easier, tests basieren
tests eagle » tests edge, tests example, tests single
studies de » studies der, studies die, studies doe

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 eagle) OR (tests easier)) studies de filosofica _ literatura".
• Adding a wildcard symbol may retrieve word variants: ((tests eagle) OR (tests easier)) studies de filosofica _ literatura*.