Perhaps you should try some spelling variations:
scale studien » scale studies, scale student, duale studien
die filosofia » di filosofia, de filosofia, e filosofia
de literatura » de litterature, la literatura, a literatura
y literatura » la literatura
tests scale » tests stable, sets scale, tests safe
studien die » studie die, studien der

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 die filosofia ((de literatura) OR (y literatura)).
• Adding a wildcard symbol may retrieve word variants: tests scale studien die filosofia ((de literatura) or (y literatura))*.