Perhaps you should try some spelling variations:
"model factor" » "models factor", "model fast"
"de factor" » "e factor", "dose factor", "mode factor", "de faitor", "de falcoor"
"de faitor" » "de fair", "de fait", "de faits", "de faitr", "de faitsr", "de fator"
"de facts" » "de faits", "cbe facts", "de fautes", "e facts", "de falcos"
"de faito" » "de fait", "de faits", "de fato"
"de facto" » "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: (((((((("de factor") OR ("de faitor"))) OR ("model factor"))) OR ((((("de facto") OR ("de facts"))) OR ("de faito"))))) OR ("de fact")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((\"de factor\") or (\"de faitor\"))) or (\"model factor\"))) or (((((\"de facto\") OR (\"de facts\"))) or (\"de faito\"))))) or (\"de fact\"))".
• Removing quotes may allow a broader search: (((((((( de factor ) or ( de faitor ))) or ( model factor ))) or ((((( de facto ) OR ( de facts ))) or ( de faito ))))) or ( de fact )).
• Adding a wildcard symbol may retrieve word variants: (((((((("de factor") or ("de faitor"))) or ("model factor"))) or ((((("de facto") OR ("de facts"))) or ("de faito"))))) or ("de fact"))*.