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