Perhaps you should try some spelling variations:
"de facteur" » "de facteurs", "le facteur", "du facteur"
"de factor" » "e factor", "dose factor", "mode factor", "de factr", "de factsr"
"de factr" » "de fazer", "de facon", "de fair"
"de facto" » "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 factor") OR ((("de factr") OR ("de facteur")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"de facto\") or (((\"de factor\") or (((\"de factr\") OR (\"de facteur\"))))))".
• Removing quotes may allow a broader search: (( de facto ) or ((( de factor ) or ((( de factr ) OR ( de facteur )))))).
• Adding a wildcard symbol may retrieve word variants: (("de facto") or ((("de factor") or ((("de factr") OR ("de facteur"))))))*.