Perhaps you should try some spelling variations:
mode factr » mode factor, model factor, modes factor
de factsr » de facteur, de facto, de faits
facto » fact
factor » factr
facts » fact
factsr » factr

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