Perhaps you should try some spelling variations:
"e factor" » "e factors", "one factor", "age factor", "_ factor", "a factor", "3 factor"
"de fact" » "de facto", "de falco", "de facon", "d_ fact", "da fact", "d3 fact"
"de fait" » "de faits", "le fait", "se fait"
"e fact" » "_ fact", "a fact", "3 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: (("e factor") OR ((((("de fact") OR ("de fait"))) OR ("e fact")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"e factor\") or (((((\"de fact\") OR (\"de fait\"))) or (\"e fact\"))))".
• Removing quotes may allow a broader search: (( e factor ) or ((((( de fact ) OR ( de fait ))) or ( e fact )))).
• Adding a wildcard symbol may retrieve word variants: (("e factor") or ((((("de fact") OR ("de fait"))) or ("e fact"))))*.