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