Perhaps you should try some spelling variations:
de litterature » la litterature, et litterature
estudio della » estudio del, studio delle, studi della
studio della » estudio del
filosofia de » filosofia del
estudios de » estudio de
bist das » ist das, list das, geist das

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: bist das ((studio della) OR (((estudio della) OR (estudios de)))) filosofia de litterature.
• Adding a wildcard symbol may retrieve word variants: bist das ((studio della) or (((estudio della) or (estudios de)))) filosofia de litterature*.