Perhaps you should try some spelling variations:
camilo perez » castillo perez, calvo perez, castro perez
medicion de » medicina de
campo perez » campos perez, crespo perez, amparo perez
edicion del » medicion del, edicion de, ediciones de
edicion el » edicion en, edicion e, adicion el
de campo » de cambio, el campo

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( medicion de campo perez la pau ; ) or ( ((edicion el) OR (edicion del)) camilo perez la paz ; ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( medicion de campo perez la pau ; ) OR ( ((edicion el) OR (edicion del)) camilo perez la paz ; )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( medicion de campo perez la pau ; ) or ( ((edicion el) OR (edicion del)) camilo perez la paz ; ))".
• Adding a wildcard symbol may retrieve word variants: (( medicion de campo perez la pau ; ) or ( ((edicion el) OR (edicion del)) camilo perez la paz ; ))*.