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

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