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

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