Perhaps you should try some spelling variations:
"de factor" » "e factor", "dose factor", "mode factor", "de factorr", "dex factor", "de factr", "de faitor", "de falcoor"
"e facto" » "e factor", "ex facto", "e fact"
"de facto" » "de factor", "dex facto", "de fact", "de faito", "e facto", "de falcoo"
"de fact" » "de fait", "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: (((("e facto") OR ((("de fact") OR ("de facto"))))) OR ("de factor")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"e facto\") or (((\"de fact\") OR (\"de facto\"))))) or (\"de factor\"))".
• Removing quotes may allow a broader search: (((( e facto ) or ((( de fact ) OR ( de facto ))))) or ( de factor )).
• Adding a wildcard symbol may retrieve word variants: (((("e facto") or ((("de fact") OR ("de facto"))))) or ("de factor"))*.