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