Perhaps you should try some spelling variations:
del litterature » de litterature, des litteratures, et litterature
das filosofia » da filosofia, la filosofia, di filosofia
sets scaled » sets scales, less scaled, sets khaled
sets scale » sets scales, set scale, sets stable
study das » study daas, study deas, study daisy

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)) study das filosofia del litterature.
• Adding a wildcard symbol may retrieve word variants: ((sets scale) or (sets scaled)) study das filosofia del litterature*.