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