Perhaps you should try some spelling variations:
"factores politicos" » "actores politicos", "actos politicos", "valores politicos"
"factores criticos" » "factor criticos", "factores clinicoss", "factores politicos"
"factores critico" » "factor critico", "factores clinicos", "factores politico"
"factores clinico" » "factores clinicos", "factores politico", "factores climaticos"
"factores fisico" » "factores basicos", "factores bioticos"

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

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