Perhaps you should try some spelling variations:
scale studien » scale studies, scale student, soziale studien
duale studien » duale studium, duales studium, dualen studium
de filosofia » e filosofia, la filosofia, a filosofia
di filosofia » la filosofia, e filosofia

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