Perhaps you should try some spelling variations:
"de factores" » "de actores", "que factores", "de sectores", "de factoores", "de faitores", "e factores"
"dose factor" » "noise factor", "one factor", "mode factor"
"de falcoo" » "de falco", "die falcon", "de facto"
"de fact" » "de facto", "de fait", "e fact"

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 ("dose factor"))) OR ("de falcoo"))) OR ("de fact")).
• Removing quotes may allow a broader search: (((((( de factores ) or ( dose factor ))) or ( de falcoo ))) or ( de fact )).
• Adding a wildcard symbol may retrieve word variants: (((((("de factores") or ("dose factor"))) or ("de falcoo"))) or ("de fact"))*.