Perhaps you should try some spelling variations:
"factores biologicos" » "factores psicologicos", "factores economicos"
"actores politicos" » "factores criticos"
"valores politicos" » "factores politicos"
"actos politicos" » "aspectos politicos", "factores politicos", "efectos politicos"
"valores eticos" » "valores eticas"

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

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