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

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