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

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