Perhaps you should try some spelling variations:
"de factor" » "de facto", "dose factor", "mode factor", "de factors", "done factor", "dage factor", "de factoor", "de faitor", "e factor"
"e factor" » "e factors", "one factor", "age factor"
"de factr" » "de facto", "de facteur", "de fazer", "de factor", "de faitr", "e factr", "de fact", "de factors", "de factory"
"de fact" » "de facto", "de fait", "e fact"
"e factr" » "e fact", "e factors", "e factory"

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 factor") OR ("e factor"))) OR ((("de factr") OR ("e factr")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"de fact\") or (((((\"de factor\") or (\"e factor\"))) or (((\"de factr\") OR (\"e factr\"))))))".
• Removing quotes may allow a broader search: (( de fact ) or ((((( de factor ) or ( e factor ))) or ((( de factr ) OR ( e factr )))))).
• Adding a wildcard symbol may retrieve word variants: (("de fact") or ((((("de factor") or ("e factor"))) or ((("de factr") OR ("e factr"))))))*.