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