Perhaps you should try some spelling variations:
"factores psicologicos" » "factores psicosociales"
"factores biologicos" » "factores economicos"
"factores politicos" » "factores criticos", "actos politicos", "factores climaticos", "factos politicos", "ffactores criticos"
"actores politicos" » "actos politicos", "factores criticos"
"valores politicos" » "valores eticos"

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

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