Perhaps you should try some spelling variations:
"mode factor" » "model factor", "models factor", "model factory", "mode factorr", "mode factr", "mod5 factor", "mode faitor", "moe factor", "mode falcoor"
"dose factor" » "noise factor", "one factor", "moore factor", "dose factorr", "dose factr", "dos5 factor"
"ex facto" » "sex factor", "ix factor", "x factor"
"de facto" » "de factor", "de fact", "d5 facto", "de faito", "e facto", "de falcoo"
"e facto" » "e factor", "e fact", "5 facto"
"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: (((((("mode factor") OR ("dose factor"))) OR ((("de facto") OR ((("e facto") OR ("ex facto"))))))) OR ("de fact")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"mode factor\") or (\"dose factor\"))) or (((\"de facto\") or (((\"e facto\") OR (\"ex facto\"))))))) or (\"de fact\"))".
• Removing quotes may allow a broader search: (((((( mode factor ) or ( dose factor ))) or ((( de facto ) or ((( e facto ) OR ( ex facto ))))))) or ( de fact )).
• Adding a wildcard symbol may retrieve word variants: (((((("mode factor") or ("dose factor"))) or ((("de facto") or ((("e facto") OR ("ex facto"))))))) or ("de fact"))*.