Perhaps you should try some spelling variations:
dd filosofia » di filosofia, de filosofia, da filosofia
e literatura » de literatura, y literatura, e literatur
sets scaled » sets scales, less scaled, sets khaled
filosofia e » filosofia de, filosofia del
sets scale » sets scales, set scale, sets stable
studien dd » studies dd, studien der, studien die

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 scaled)) studien dd filosofia e literatura.
• Adding a wildcard symbol may retrieve word variants: ((sets scale) or (sets scaled)) studien dd filosofia e literatura*.