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

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