Perhaps you should try some spelling variations:
"mode factor" » "model factor", "models factor", "model factors", "mode facto", "moe factor", "mode factores"
"dose factor" » "noise factor", "one factor", "moore factor"
"de factor" » "de facto", "e factor", "de factores"
"de fait" » "de faits", "le fait", "se 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 ("mode factor"))) OR ("dose factor"))) OR ("de fait")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"de factor\") OR (\"mode factor\"))) or (\"dose factor\"))) or (\"de fait\"))".
• Removing quotes may allow a broader search: (((((( de factor ) OR ( mode factor ))) or ( dose factor ))) or ( de fait )).
• Adding a wildcard symbol may retrieve word variants: (((((("de factor") OR ("mode factor"))) or ("dose factor"))) or ("de fait"))*.