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

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("factores criticos") or ((((("ffactores criticos") or ("factores clinicos"))) or ("sectores criticos"))))) or ("actores politicos"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("factores criticos") OR ((((("ffactores criticos") OR ("factores clinicos"))) OR ("sectores criticos"))))) OR ("actores politicos")).
• Removing quotes may allow a broader search: (((( factores criticos ) or ((((( ffactores criticos ) or ( factores clinicos ))) or ( sectores criticos ))))) or ( actores politicos )).
• Adding a wildcard symbol may retrieve word variants: (((("factores criticos") or ((((("ffactores criticos") or ("factores clinicos"))) or ("sectores criticos"))))) or ("actores politicos"))*.

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