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