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

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