Perhaps you should try some spelling variations:
"factores climaticos" » "factores explicativos"
"factores politicos" » "valores politicos", "factores biologicos", "efectos politicos", "fvalores politicos"
"actores politicos" » "valores politicos"
"factores critica" » "factores clinico", "factor critico", "factores clinicos"
"actos politicos" » "aspectos politicos", "efectos politicos", "ciclos 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 climaticos"))) or ((((("actores politicos") or ("actos politicos"))) or ((("factores criticos") OR ("factores critica"))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("factores politicos") OR ("factores climaticos"))) OR ((((("actores politicos") OR ("actos politicos"))) OR ((("factores criticos") OR ("factores critica")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"factores politicos\") or (\"factores climaticos\"))) or (((((\"actores politicos\") or (\"actos politicos\"))) or (((\"factores criticos\") OR (\"factores critica\"))))))".
• Removing quotes may allow a broader search: (((( factores politicos ) or ( factores climaticos ))) or ((((( actores politicos ) or ( actos politicos ))) or ((( factores criticos ) OR ( factores critica )))))).
• Adding a wildcard symbol may retrieve word variants: (((("factores politicos") or ("factores climaticos"))) or ((((("actores politicos") or ("actos politicos"))) or ((("factores criticos") OR ("factores critica"))))))*.

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