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

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