Perhaps you should try some spelling variations:
"mode factor" » "model factor", "models factor", "model factors", "mode factr", "mode factsr"
"de factoor" » "de facteur", "de factor", "de factsor"
"de faito" » "de fait", "de faits", "de fato"
"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 factoor") OR ("mode factor"))) OR ("de faito"))) OR ("de facto")).
• Removing quotes may allow a broader search: (((((( de factoor ) or ( mode factor ))) or ( de faito ))) or ( de facto )).
• Adding a wildcard symbol may retrieve word variants: (((((("de factoor") or ("mode factor"))) or ("de faito"))) or ("de facto"))*.