Perhaps you should try some spelling variations:
de facteur » de facteurs, le facteur, du facteur
de factsr » de faits
de factor » e factor, dose factor, mode factor
facto » fact, facts
factor » factr, factsr

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