Perhaps you should try some spelling variations:
"de factor" » "de facto", "dose factor", "mode factor", "de factors", "done factor", "dage factor", "d_ factor", "d3 factor", "d5 factor"
"e factor" » "e factors", "one factor", "age factor", "_ factor", "3 factor", "5 factor"
"e fact" » "_ fact", "3 fact", "5 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 fact") OR ((("de factor") OR ("e factor"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"e fact\") or (((\"de factor\") OR (\"e factor\"))))*".
• Removing quotes may allow a broader search: (( e fact ) or ((( de factor ) OR ( e factor ))))*.