Perhaps you should try some spelling variations:
"factores biologicos" » "factores psicologicos", "factores economicos"
"efectos politicos" » "aspectos politicos", "derechos politicos", "efectos juridicos"
"actores politicos" » "factores politicos", "valores politicos"
"actos politicos" » "aspectos politicos", "factores politicos", "ciclos politicos"
"factores criticos" » "factores critico", "factores critica", "factores critical"

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: (((((("efectos politicos") or ("factores biologicos"))) or ("actos politicos"))) or ((("actores politicos") or ("factores criticos"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("efectos politicos") OR ("factores biologicos"))) OR ("actos politicos"))) OR ((("actores politicos") OR ("factores criticos")))).
• Removing quotes may allow a broader search: (((((( efectos politicos ) or ( factores biologicos ))) or ( actos politicos ))) or ((( actores politicos ) or ( factores criticos )))).
• Adding a wildcard symbol may retrieve word variants: (((((("efectos politicos") or ("factores biologicos"))) or ("actos politicos"))) or ((("actores politicos") or ("factores criticos"))))*.

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