Perhaps you should try some spelling variations:
"dux factor" » "x factor", "ix factor", "sex factor"
"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: (((("dux factor") OR ("e facto"))) OR ((("de fact") OR ("de facto")))).
• Removing quotes may allow a broader search: (((( dux factor ) or ( e facto ))) or ((( de fact ) or ( de facto )))).
• Adding a wildcard symbol may retrieve word variants: (((("dux factor") or ("e facto"))) or ((("de fact") or ("de facto"))))*.