Perhaps you should try some spelling variations:
"de factoos" » "de factores", "de facto", "de fatos", "de factooos", "de faitoos", "e factoos"
"de factos" » "de facto", "de fatos", "de factores", "de factoos", "de faitos", "e factos"
"e factor" » "e factors", "one factor", "age factor"
"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 fact") OR ("e factor"))) OR ((("de factos") OR ("de factoos")))).
• Removing quotes may allow a broader search: (((( de fact ) or ( e factor ))) or ((( de factos ) or ( de factoos )))).
• Adding a wildcard symbol may retrieve word variants: (((("de fact") or ("e factor"))) or ((("de factos") or ("de factoos"))))*.