Perhaps you should try some spelling variations:
"dose factor" » "noise factor", "one factor", "mode factor", "dose factr", "dose factsr"
"age factor" » "age factors", "male factor", "one factor", "age factr", "age 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 falco"))) OR ((("age factor") OR ("dose factor")))).
• Removing quotes may allow a broader search: (((( de facto ) or ( de falco ))) or ((( age factor ) or ( dose factor )))).
• Adding a wildcard symbol may retrieve word variants: (((("de facto") or ("de falco"))) or ((("age factor") or ("dose factor"))))*.