Perhaps you should try some spelling variations:
"dose factor" » "noise factor", "one factor", "mode factor", "dose factsr"
"age factor" » "age factors", "male factor", "one factor", "age factsr"
"de facto" » "de faito", "e facto", "de falcoo", "de facts"
"de fact" » "de fait", "e fact", "de falco"

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 ("dose factor"))) OR ("de facto"))) OR ("de fact"))*.
• Removing quotes may allow a broader search: (((((( age factor ) or ( dose factor ))) or ( de facto ))) or ( de fact ))*.