Perhaps you should try some spelling variations:
"e factor" » "e factors", "one factor", "age factor", "ex factor", "e factr", "5 factor"
"5 factor" » "5 factors", "15 factors", "5 facts"
"e facto" » "ex facto", "e fact", "5 facto"
"de facto" » "dex facto", "de fact", "d5 facto"

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 facto") OR ((("de facto") OR ((("e factor") OR ("5 factor")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"e facto\") or (((\"de facto\") or (((\"e factor\") OR (\"5 factor\"))))))".
• Removing quotes may allow a broader search: (( e facto ) or ((( de facto ) or ((( e factor ) OR ( 5 factor )))))).
• Adding a wildcard symbol may retrieve word variants: (("e facto") or ((("de facto") or ((("e factor") OR ("5 factor"))))))*.