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