Perhaps you should try some spelling variations:
"dose factor" » "noise factor", "one factor", "mode factor", "dose factr"
"de factor" » "e factor", "mode factor", "de factores", "de factr"
"de facts" » "de faits", "cbe facts", "de fautes"
"de facto" » "de fact"

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 facto") OR ("de facts"))) OR ((("de factor") OR ("dose factor")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"de facto\") or (\"de facts\"))) or (((\"de factor\") OR (\"dose factor\"))))".
• Removing quotes may allow a broader search: (((( de facto ) or ( de facts ))) or ((( de factor ) OR ( dose factor )))).
• Adding a wildcard symbol may retrieve word variants: (((("de facto") or ("de facts"))) or ((("de factor") OR ("dose factor"))))*.