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

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