Perhaps you should try some spelling variations:
"de factor" » "dose factor", "mode factor", "de factores", "de factors", "done factor", "dage factor", "de factr", "de factsr"
"e factor" » "e factors", "one factor", "age factor", "e factr", "e factsr"
"e factsr" » "e factors", "e factory", "e fact"
"de facto" » "de fact", "de facts"

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