Perhaps you should try some spelling variations:
scale studien » scale studies, scale student, duale studien
filosofia di » filosofia da, filosofia del, 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "tests scale studien de ((filosofia di) OR (filosofia de)) literatura".
• Adding a wildcard symbol may retrieve word variants: tests scale studien de ((filosofia di) OR (filosofia de)) literatura*.