Perhaps you should try some spelling variations:
"mode factor" » "model factor", "models factor", "model factory", "mode factoor", "mode faitor", "moe factor"
"age factor" » "age factors", "male factor", "one factor"
"de facts" » "de facto", "de faits", "cbe facts", "de factos", "e facts"
"de fact" » "de facto", "de fait", "e 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: (((((("age factor") OR ("mode factor"))) OR ("de facts"))) OR ("de fact")).
• Removing quotes may allow a broader search: (((((( age factor ) or ( mode factor ))) or ( de facts ))) or ( de fact )).
• Adding a wildcard symbol may retrieve word variants: (((((("age factor") or ("mode factor"))) or ("de facts"))) or ("de fact"))*.