Perhaps you should try some spelling variations:
"de factor" » "e factor", "dose factor", "mode factor", "d_ factor", "da factor", "d3 factor", "de factsr"
"de fait" » "de faits", "le fait", "se fait"
"de facto" » "d_ facto", "da facto", "d3 facto", "de facts"
"e fact" » "_ fact", "a fact", "3 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 factor") OR ("de facto"))) OR ((("e fact") OR ("de fait")))).
• Removing quotes may allow a broader search: (((( de factor ) or ( de facto ))) or ((( e fact ) or ( de fait )))).
• Adding a wildcard symbol may retrieve word variants: (((("de factor") or ("de facto"))) or ((("e fact") or ("de fait"))))*.