Perhaps you should try some spelling variations:
"de factoor" » "de facto", "de facteur", "dde factoor", "de factoror", "de factor", "de factooor", "de faitoor", "e factoor"
"ex facto" » "sex factor", "ix factor", "de facto"
"e facto" » "de facto", "e factor", "e fact"
"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: (((((("e facto") OR ("ex facto"))) OR ("de fact"))) OR ("de factoor")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"e facto\") OR (\"ex facto\"))) or (\"de fact\"))) or (\"de factoor\"))".
• Removing quotes may allow a broader search: (((((( e facto ) OR ( ex facto ))) or ( de fact ))) or ( de factoor )).
• Adding a wildcard symbol may retrieve word variants: (((((("e facto") OR ("ex facto"))) or ("de fact"))) or ("de factoor"))*.