Perhaps you should try some spelling variations:
scale studien » scale studies, scale student, duale studien
de filosofica » de filosofia, e filosofica, di filosofia
da literatura » la literatura, a literatura, de literatura
tests scale » tests stable, sets scale, tests safe
e filosofia » la filosofia

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 filosofica) OR (e filosofia)) da literatura".
• Adding a wildcard symbol may retrieve word variants: tests scale studien ((de filosofica) OR (e filosofia)) da literatura*.