Perhaps you should try some spelling variations:
de filosofia » e filosofia, la filosofia, a filosofia
di filosofia » la filosofia, e filosofia
sets scales » sets scaled, sets locales, sites scales
sets scale » sets scaled, set scale, sets stable

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