Perhaps you should try some spelling variations:
"mod_ factor" » "mode factor", "modi factor", "model factor", "mod_ factsr"
"mod3 factor" » "mode factor", "modi factor", "model factor", "mod3 factsr"
"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: (((((("mod_ factor") OR ("mod3 factor"))) OR ("de facto"))) OR ("e fact")).
• Removing quotes may allow a broader search: (((((( mod_ factor ) or ( mod3 factor ))) or ( de facto ))) or ( e fact )).
• Adding a wildcard symbol may retrieve word variants: (((((("mod_ factor") or ("mod3 factor"))) or ("de facto"))) or ("e fact"))*.