Perhaps you should try some spelling variations:
"de factorses" » "de factores", "e factors", "3e factors", "de factorsses", "done factorses", "dage factorses"
"dose factor" » "noise factor", "one factor", "mode factor", "dose factors", "dosone factor", "dosage factor"
"e factor" » "e factors", "one factor", "age factor"

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 factorses") OR ("e factor"))) OR ("dose factor")).
• Removing quotes may allow a broader search: (((( de factorses ) or ( e factor ))) or ( dose factor )).
• Adding a wildcard symbol may retrieve word variants: (((("de factorses") or ("e factor"))) or ("dose factor"))*.