Perhaps you should try some spelling variations:
dd filosofia » di filosofia, de filosofia, da filosofia
y literatura » la literatura
sets scales » sets scaled, sets locales, sites scales
filosofia y » filosofia e, filosofia _, filosofia de
sets scale » sets scaled, 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 scales)) studien dd filosofia y literatura*.