Perhaps you should try some spelling variations:
"dose factor" » "noise factor", "one factor", "mode factor"
"de factor" » "de facto", "e factor", "mode factor"
"de faits" » "des faits", "les faits", "de traits", "le faits", "se faits", "du faits"
"de fait" » "le fait", "se fait", "du fait"

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