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

One or more facet filters have been applied to this search. If you remove filters, you may retrieve more results. Remove all filters from this search.