Perhaps you should try some spelling variations:
"d5 factor" » "5 factor", "15 factor", "55 factor"
"de factor" » "de facto", "e factor", "dose factor", "da factor", "d3 factor", "d5 factor"
"da fact" » "a fact", "data fact", "da feast"
"e fact" » "a fact", "3 fact", "5 fact"
"_ fact" » "_ facts", "_ face"

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: (((("da fact") OR ((("e fact") OR ("_ fact"))))) OR ((("de factor") OR ("d5 factor")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"da fact\") or (((\"e fact\") or (\"_ fact\"))))) or (((\"de factor\") OR (\"d5 factor\"))))".
• Removing quotes may allow a broader search: (((( da fact ) or ((( e fact ) or ( _ fact ))))) or ((( de factor ) OR ( d5 factor )))).
• Adding a wildcard symbol may retrieve word variants: (((("da fact") or ((("e fact") or ("_ fact"))))) or ((("de factor") OR ("d5 factor"))))*.