Perhaps you should try some spelling variations:
e literatura » de literatura, y literatura, e literatur
sets scales » sets scaled, sets locales, sites scales
studien der » studie der, studenten der
filosofia e » filosofia de, filosofia del
sets scale » sets scaled, set scale, sets stable
studien dd » studies dd, studien die, studien des

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