Perhaps you should try some spelling variations:
scale studien » scale studies, scale student, duale studien
di literatura » de literatura, da literatura, ii literatura
de filosofia » di filosofia, la filosofia, a filosofia
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 filosofia) OR (e filosofia)) di literatura".
• Adding a wildcard symbol may retrieve word variants: tests scale studien ((de filosofia) OR (e filosofia)) di literatura*.