Perhaps you should try some spelling variations:
"mode factor" » "model factor", "models factor", "model factors", "moe factor", "modose factor", "mode factores", "mode factr", "mode factsr"
"de factor" » "e factor", "dose factor", "de factores", "de factr", "de factsr"
"de facto" » "de fact", "de facts"

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