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