Perhaps you should try some spelling variations:
"factores politicos" » "actos politicos", "valores politicos", "factores biologicos", "factores clinicos", "actos politicoss", "valores politicoss"
"fvalores politicos" » "valores politicos"
"factores politico" » "factores clinico", "actos politicos", "valores politicos"
"factores criticos" » "factores critico", "factores critica", "factores critical"

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