Perhaps you should try some spelling variations:
ernesto perez » crespo perez
ediciones un » ediciones en, mediciones en, ediciones con
caso javier » cano javier, caro javier, castro javier
edicion y » edicion de
y ernesto » de ernesto
javier e » javier de
e parto » el parto, de parto, y parto

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: (( ediciones un caso javier e parto ; ) OR ( edicion y ernesto perez yanelis (paul OR raul) ; ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ediciones un caso javier e parto ; ) or ( edicion y ernesto perez yanelis (paul OR raul) ; ))~".
• Adding a wildcard symbol may retrieve word variants: (( ediciones un caso javier e parto ; ) or ( edicion y ernesto perez yanelis (paul OR raul) ; ))*.