Perhaps you should try some spelling variations:
"factores climaticos" » "factores explicativos"
"factores politicos" » "valores politicos", "factores biologicos", "factores bioticos"
"efectos politicos" » "aspectos politicos", "derechos politicos", "efectos juridicos"
"actos politicos" » "aspectos politicos", "ciclos politicos", "partidos politicos"
"factores criticos" » "factores critico", "factores critica", "factores critical"

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

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