Perhaps you should try some spelling variations:
"factores biologicos" » "factores psicologicos", "factores economicos"
"valores politicos" » "factores politicos", "valores eticos"
"ciclos politicos" » "efectos politicos"
"actos politicos" » "aspectos politicos", "factores politicos", "efectos 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: (((((("valores politicos") or ("factores biologicos"))) or ((("actos politicos") or ("ciclos politicos"))))) or ((("actores politicos") or ("factores criticos"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("valores politicos") OR ("factores biologicos"))) OR ((("actos politicos") OR ("ciclos politicos"))))) OR ((("actores politicos") OR ("factores criticos")))).
• Removing quotes may allow a broader search: (((((( valores politicos ) or ( factores biologicos ))) or ((( actos politicos ) or ( ciclos politicos ))))) or ((( actores politicos ) or ( factores criticos )))).
• Adding a wildcard symbol may retrieve word variants: (((((("valores politicos") or ("factores biologicos"))) or ((("actos politicos") or ("ciclos politicos"))))) or ((("actores politicos") or ("factores criticos"))))*.

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