Perhaps you should try some spelling variations:
"de factores" » "de actores", "que factores", "de sectores", "de factorses", "de factres", "de factsres"
"de fait" » "de faits", "le fait", "se fait"
"noise factor" » "noise factors", "noise factr", "noise factsr"
"de facto" » "de fact", "de facts"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("de factores") OR ("noise factor"))) OR ("de facto"))) OR ("de fait")).
• Removing quotes may allow a broader search: (((((( de factores ) or ( noise factor ))) or ( de facto ))) or ( de fait )).
• Adding a wildcard symbol may retrieve word variants: (((((("de factores") or ("noise factor"))) or ("de facto"))) or ("de fait"))*.