Perhaps you should try some spelling variations:
eestudio del » estudio de, estudios del, studio del
filosofia de » filosofia del
estudio del » estudio de
estudios de » estudio de
filosofia y » filosofia e, filosofia _, filosofia da
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 ((estudio del) OR (((eestudio del) OR (estudios de)))) ((filosofia y) OR (filosofia de)) literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "bist das ((estudio del) or (((eestudio del) or (estudios de)))) ((filosofia y) OR (filosofia de)) literatura".
• Adding a wildcard symbol may retrieve word variants: bist das ((estudio del) or (((eestudio del) or (estudios de)))) ((filosofia y) OR (filosofia de)) literatura*.