Perhaps you should try some spelling variations:
"factores politicos" » "actores politicos", "actos politicos", "factores biologicos"
"valores politicos" » "actores politicos", "valores eticos"
"factores clinicos" » "factores clinico", "factores climaticos", "factores tecnicos"
"factores criticos" » "factor criticos", "factores clinicos", "factores politicos"
"factores critico" » "factor critico", "factores clinico", "factores politico"

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

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