Perhaps you should try some spelling variations:
"dose factor" » "noise factor", "one factor", "mode factor", "dose factr", "dose factsr"
"de factoor" » "de facteur", "de factor", "de factsor"
"de fato" » "de falco", "de facon", "de 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 factoor") OR ("dose factor"))) OR ("de fato"))) OR ("de facto")).
• Removing quotes may allow a broader search: (((((( de factoor ) or ( dose factor ))) or ( de fato ))) or ( de facto )).
• Adding a wildcard symbol may retrieve word variants: (((((("de factoor") or ("dose factor"))) or ("de fato"))) or ("de facto"))*.