Perhaps you should try some spelling variations:
"dose factor" » "noise factor", "one factor", "mode factor", "dose factsr"
"de factor" » "e factor", "mode factor", "de factores", "de factsr"
"_ fact" » "_ facts", "_ face"
"de facto" » "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 ("dose factor"))) OR ("de facto"))) OR ("_ fact")).
• Removing quotes may allow a broader search: (((((( de factor ) or ( dose factor ))) or ( de facto ))) or ( _ fact )).
• Adding a wildcard symbol may retrieve word variants: (((((("de factor") or ("dose factor"))) or ("de facto"))) or ("_ fact"))*.