Perhaps you should try some spelling variations:
"de factor" » "de facto", "dose factor", "mode factor", "de factors", "done factor", "dage factor", "de factoor", "e factor", "de falcoor"
"e factor" » "e factors", "one factor", "age factor"
"de faits" » "des faits", "les faits", "de traits", "le faits", "se faits", "du faits"
"de fait" » "le fait", "se fait", "du fait"
"de fact" » "de facto", "e fact", "de falco"

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