Perhaps you should try some spelling variations:
"desastres naturales saneamiento." » "desastres naturales lanzamiento.", "desastres naturales planteamiento.", "desastres naturales lineamientos."
"Desastres naturales planeamiento." » "Desastres naturales planteamiento.", "Desastres naturales pensamiento."
"Desastres naturaleza planeamiento." » "Desastres naturaleza planteamiento.", "Desastres naturaleza pensamiento."

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("desastres naturales saneamiento.") or ((("Desastres naturales planeamiento.") OR ("Desastres naturaleza planeamiento."))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("desastres naturales saneamiento.") OR ((("Desastres naturales planeamiento.") OR ("Desastres naturaleza planeamiento.")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"desastres naturales saneamiento.\") or (((\"Desastres naturales planeamiento.\") OR (\"Desastres naturaleza planeamiento.\"))))".
• Removing quotes may allow a broader search: (( desastres naturales saneamiento. ) or ((( Desastres naturales planeamiento. ) OR ( Desastres naturaleza planeamiento. )))).
• Adding a wildcard symbol may retrieve word variants: (("desastres naturales saneamiento.") or ((("Desastres naturales planeamiento.") OR ("Desastres naturaleza planeamiento."))))*.

One or more facet filters have been applied to this search. If you remove filters, you may retrieve more results. Remove all filters from this search.