Perhaps you should try some spelling variations:
scale studien » scale studies, scale student, duale studien
de literatura » de litterature, la literatura, y literatura
da filosofia » la filosofia, di filosofia, a filosofia
tests scale » tests stable, sets scale, tests safe
e filosofia » la 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 scale studien ((da filosofia) OR (e filosofia)) de literatura.
• Adding a wildcard symbol may retrieve word variants: tests scale studien ((da filosofia) or (e filosofia)) de literatura*.