Perhaps you should try some spelling variations:
"ffactores criticos" » "factores criticos", "factores clinicos", "sectores criticos"
"valores politicos" » "factores politicos", "actores politicos", "valores eticos"
"lectores criticos" » "sectores criticos", "factores criticos", "errores criticos"
"actos politicos" » "actores politicos", "aspectos politicos", "factores 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: (((("valores politicos") or ((("ffactores criticos") or ("lectores criticos"))))) or ("actos politicos"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("valores politicos") OR ((("ffactores criticos") OR ("lectores criticos"))))) OR ("actos politicos")).
• Removing quotes may allow a broader search: (((( valores politicos ) or ((( ffactores criticos ) or ( lectores criticos ))))) or ( actos politicos )).
• Adding a wildcard symbol may retrieve word variants: (((("valores politicos") or ((("ffactores criticos") or ("lectores criticos"))))) or ("actos politicos"))*.