Perhaps you should try some spelling variations:
"de facteur" » "de facteurs", "le facteur", "du facteur"
"e factoor" » "e factor", "e factors", "e faktor", "e factoror", "e factsor"
"de facon" » "de falco", "la facon", "en facon"
"de facto" » "de factor", "de fact", "de facts"

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 facto") OR ((("de facteur") OR ("de facon"))))) OR ("e factoor")).
• Removing quotes may allow a broader search: (((( de facto ) or ((( de facteur ) or ( de facon ))))) or ( e factoor )).
• Adding a wildcard symbol may retrieve word variants: (((("de facto") or ((("de facteur") or ("de facon"))))) or ("e factoor"))*.