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