Perhaps you should try some spelling variations:
"model factor" » "models factor", "model fast", "model factr", "model factsr"
"de factor" » "e factor", "dose factor", "mode factor", "de factr", "de factsr"
"de faits" » "des faits", "de fait", "les faits"
"de facto" » "de fact", "de facts"

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 ("model factor"))) OR ("de faits"))) OR ("de facto")).
• Removing quotes may allow a broader search: (((((( de factor ) or ( model factor ))) or ( de faits ))) or ( de facto )).
• Adding a wildcard symbol may retrieve word variants: (((((("de factor") or ("model factor"))) or ("de faits"))) or ("de facto"))*.