Perhaps you should try some spelling variations:
"de factors" » "de factores", "e factors", "3e factors", "de factorss", "dage factors", "de factoors", "de faitors"
"e factor" » "e factors", "age factor"
"one factor" » "one factors", "onage 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 ((("de factors") OR ((("e factor") OR ("one factor")))))).
• Removing quotes may allow a broader search: (( de fact ) or ((( de factors ) or ((( e factor ) or ( one factor )))))).
• Adding a wildcard symbol may retrieve word variants: (("de fact") or ((("de factors") or ((("e factor") or ("one factor"))))))*.