Perhaps you should try some spelling variations:
"six factor" » "six factors", "sex factor", "sex factors", "sx factor", "ssix factors", "ssex factor"
"de factor" » "de facto", "e factor", "dose factor", "dde factor", "de factorr", "d5 factor", "d_ factor", "da factor", "d3 factor"
"dex facto" » "de facto", "sex factor", "dux factor", "dsex factor", "dde facto", "dx factor"
"ix factor" » "x factor", "six factors", "sex factor"
"ex facto" » "sex factor", "de facto", "x factor"
"e facto" » "de facto", "e factor", "5 facto", "_ facto", "a facto", "3 facto"
"e fact" » "_ fact", "a fact", "3 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: (((((("de factor") OR ("dex facto"))) OR ((("e facto") OR ((("ex facto") OR ((("ix factor") OR ("six factor"))))))))) OR ("e fact")).
• Removing quotes may allow a broader search: (((((( de factor ) or ( dex facto ))) or ((( e facto ) or ((( ex facto ) or ((( ix factor ) or ( six factor ))))))))) or ( e fact )).
• Adding a wildcard symbol may retrieve word variants: (((((("de factor") or ("dex facto"))) or ((("e facto") or ((("ex facto") or ((("ix factor") or ("six factor"))))))))) or ("e fact"))*.