Perhaps you should try some spelling variations:
"de factoeur" » "le facteur", "de facteurs", "de factooeur", "de faitoeur", "e factoeur"
"de facteur" » "de facteurs", "le facteur", "du facteur", "de factoeur", "de faiteur", "e facteur"
"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 facteur") OR ("de factoeur"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"de fact\") or (((\"de facteur\") OR (\"de factoeur\"))))*".
• Removing quotes may allow a broader search: (( de fact ) or ((( de facteur ) OR ( de factoeur ))))*.