Perhaps you should try some spelling variations:
"factores politicos" » "actos politicos", "valores politicos", "factores biologicos"
"ffactores criticos" » "lectores criticos", "factores climaticos", "factores bioticos"
"factores clinicos" » "factores clinico", "factores climaticos", "factores tecnicos"
"sectores criticos" » "lectores criticos", "errores criticos", "seres criticos"

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

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