Perhaps you should try some spelling variations:
"one factors" » "core factors", "age factors", "e factors", "one factorss", "onage factors"
"e factor" » "e factors", "age factor"
"one factor" » "one factors", "onage factor"
"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: (((("e factor") OR ((("one factor") OR ("one factors"))))) OR ("de fact")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"e factor\") or (((\"one factor\") OR (\"one factors\"))))) or (\"de fact\"))".
• Removing quotes may allow a broader search: (((( e factor ) or ((( one factor ) OR ( one factors ))))) or ( de fact )).
• Adding a wildcard symbol may retrieve word variants: (((("e factor") or ((("one factor") OR ("one factors"))))) or ("de fact"))*.