Perhaps you should try some spelling variations:
"de facteur" » "de facteurs", "le facteur", "du facteur", "de factoeur", "de faiteur", "e facteur"
"de factr" » "de facto", "de fazer", "de facon", "de factor", "de faitr", "e factr", "de fact", "de factors"
"de fact" » "de facto", "de fait", "e fact"
"e factr" » "e factor", "e fact", "e factors"

You may be able to get more results by adjusting your search query.

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