Perhaps you should try some spelling variations:
"de factor" » "de facto", "dose factor", "mode factor", "de factors", "done factor", "dage factor", "de factoor", "de faitor", "de falcoor", "d_ factor", "da factor", "d3 factor"
"e factor" » "e factors", "one factor", "age factor", "_ factor", "a factor", "3 factor"
"de factr" » "de facto", "de facteur", "de fazer", "de factor", "de faitr", "de falcor", "d_ factr", "da factr", "d3 factr"
"de fact" » "de facto", "de fait", "de falco", "d_ fact", "da fact", "d3 fact"
"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: (((("de fact") OR ("e fact"))) OR ((((("de factor") OR ("e factor"))) OR ("de factr")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"de fact\") OR (\"e fact\"))) or (((((\"de factor\") or (\"e factor\"))) or (\"de factr\"))))".
• Removing quotes may allow a broader search: (((( de fact ) OR ( e fact ))) or ((((( de factor ) or ( e factor ))) or ( de factr )))).
• Adding a wildcard symbol may retrieve word variants: (((("de fact") OR ("e fact"))) or ((((("de factor") or ("e factor"))) or ("de factr"))))*.