Perhaps you should try some spelling variations:
"mode factor" » "model factor", "models factor", "model factory", "mode facto", "moe factor", "modose factor", "modde factor", "mode factorr", "modex factor", "mode factoor", "mode faitor"
"de factor" » "de facto", "e factor", "dose factor", "dde factor", "de factorr", "dex factor", "de factoor", "de faitor"
"e facto" » "de facto", "e factor", "ex facto"
"de fact" » "de facto", "de fait", "e fact"

You may be able to get more results by adjusting your search query.

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