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