Perhaps you should try some spelling variations:
"e factor" » "e factors", "one factor", "age factor"
"de facon" » "de facto", "de falco", "la facon"
"de fact" » "de facto", "e fact", "de falco"
"de fait" » "de faits", "le fait", "se fait"
"a fact" » "a face", "a 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: (("e factor") OR ((((((("de fact") OR ("de facon"))) OR ("de fait"))) OR ("a fact")))).
• Removing quotes may allow a broader search: (( e factor ) or ((((((( de fact ) or ( de facon ))) or ( de fait ))) or ( a fact )))).
• Adding a wildcard symbol may retrieve word variants: (("e factor") or ((((((("de fact") or ("de facon"))) or ("de fait"))) or ("a fact"))))*.