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