Perhaps you should try some spelling variations:
"factores psicologicos" » "factores psicosociales"
"factores politicos" » "actos politicos", "factores biologicos", "factores climaticos"
"valores politicos" » "valores eticos"
"factores criticos" » "factores critico", "factores critica", "factores critical"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("factores psicologicos") or ((((("actores politicos") OR ("valores politicos"))) or ("factores politicos"))))) or ("factores criticos"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("factores psicologicos") OR ((((("actores politicos") OR ("valores politicos"))) OR ("factores politicos"))))) OR ("factores criticos"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"factores psicologicos\") or (((((\"actores politicos\") OR (\"valores politicos\"))) or (\"factores politicos\"))))) or (\"factores criticos\"))*".
• Removing quotes may allow a broader search: (((( factores psicologicos ) or ((((( actores politicos ) OR ( valores politicos ))) or ( factores politicos ))))) or ( factores criticos ))*.