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

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