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

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