Perhaps you should try some spelling variations:
dd filosofia » di filosofia, da filosofia, la filosofia
de filosofia » e filosofia, di filosofia, la filosofia
e literatura » de literatura, y literatura, e literatur
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 ((dd filosofia) OR (de filosofia)) e literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((sets scale) or (sets scales)) studien ((dd filosofia) OR (de filosofia)) e literatura".
• Adding a wildcard symbol may retrieve word variants: ((sets scale) or (sets scales)) studien ((dd filosofia) OR (de filosofia)) e literatura*.