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

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("fvalores politicos") OR ((((("actores politicos") OR ("valores politicos"))) OR ("factores critical"))))~.
• Removing quotes may allow a broader search: (( fvalores politicos ) or ((((( actores politicos ) or ( valores politicos ))) or ( factores critical ))))~.
• Adding a wildcard symbol may retrieve word variants: (("fvalores politicos") or ((((("actores politicos") or ("valores politicos"))) or ("factores critical"))))*.