Perhaps you should try some spelling variations:
"factores climaticos" » "factores criticos", "factores explicativos"
"factores politicos" » "factores criticos", "actos politicos", "factores biologicos", "ffactores criticos"
"valores politicos" » "valores eticos"
"actores politicos" » "factores criticos"
"factores clinicos" » "factores clinico", "factores criticos", "factores tecnicos"

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 ((("actores politicos") or ((("factores clinicos") OR ("factores climaticos"))))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("factores politicos") OR ("valores politicos"))) OR ((("actores politicos") OR ((("factores clinicos") OR ("factores climaticos")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"factores politicos\") or (\"valores politicos\"))) or (((\"actores politicos\") or (((\"factores clinicos\") OR (\"factores climaticos\"))))))".
• Removing quotes may allow a broader search: (((( factores politicos ) or ( valores politicos ))) or ((( actores politicos ) or ((( factores clinicos ) OR ( factores climaticos )))))).
• Adding a wildcard symbol may retrieve word variants: (((("factores politicos") or ("valores politicos"))) or ((("actores politicos") or ((("factores clinicos") OR ("factores climaticos"))))))*.

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