Perhaps you should try some spelling variations:
"factores climaticos" » "factores explicativos"
"factores politicos" » "actos politicos", "valores politicos", "factores biologicos", "factos politicos", "fvalores politicos"
"sectores criticos" » "errores criticos", "seres criticos", "aspectos criticos"
"actores politicos" » "actos politicos", "valores politicos"

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: (((((("factores politicos") OR ("factores criticos"))) or ((("factores climaticos") or ("sectores criticos"))))) or ("actores politicos"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("factores politicos") OR ("factores criticos"))) OR ((("factores climaticos") OR ("sectores criticos"))))) OR ("actores politicos")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"factores politicos\") OR (\"factores criticos\"))) or (((\"factores climaticos\") or (\"sectores criticos\"))))) or (\"actores politicos\"))".
• Removing quotes may allow a broader search: (((((( factores politicos ) OR ( factores criticos ))) or ((( factores climaticos ) or ( sectores criticos ))))) or ( actores politicos )).
• Adding a wildcard symbol may retrieve word variants: (((((("factores politicos") OR ("factores criticos"))) or ((("factores climaticos") or ("sectores criticos"))))) or ("actores politicos"))*.

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