Perhaps you should try some spelling variations:
tests easier » gets easier, tasks easier, tests basieren
filosofica a » filosofica da, filosofica e, filosofica _
a literatura » la literatura, a literature, y literatura
studies due » studies doe, studies does, studies dose
studies die » studie die, studien die, studies does

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 easier ((studies due) OR (studies die)) filosofica a literatura.
• Adding a wildcard symbol may retrieve word variants: tests easier ((studies due) or (studies die)) filosofica a literatura*.