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