Perhaps you should try some spelling variations:
conditions 21st » conditions 20th
cambio del » cambio de, cambio el, cambio en
edicion un » medicion un, edicion en, mediacion un
un campo » un camino, un cambio, un caso
del el » del eln, del eo
el pas » el pais, el paso, el pase
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: (( conditions 21st cambio del el pas ; ) or ( edicion un campo de la pau ; ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( conditions 21st cambio del el pas ; ) OR ( edicion un campo de la pau ; )).
• Adding a wildcard symbol may retrieve word variants: (( conditions 21st cambio del el pas ; ) or ( edicion un campo de la pau ; ))*.