Perhaps you should try some spelling variations:
condicion de » condiciones de
medicion de » medicina de
campo perez » campos perez, camilo perez, crespo perez
de campo » de cambio, el campo
poder la » poder en, poder de
poder el » poder del, poder en, poder de
la pau » la paz

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