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