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

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