Perhaps you should try some spelling variations:
scale studien » scale studies, scale student, duale studien
filosofia ii » filosofia di, filosofica di, filosofia e
filosofia de » filosofia del
tests scale » tests stable, sets scale, tests safe
studien de » studien der, studien die, studien des

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 de ((filosofia ii) OR (filosofia de)) literature*.