Perhaps you should try some spelling variations:
"da factor" » "a factor", "data factor", "rdna factor"
"d_ facto" » "de facto", "_ facts", "_ fact"
"d3 facts" » "3 facts", "13 facts", "43 facts"
"23 facts" » "2.3 facts", "3 facts", "13 facts"
"e fact" » "_ fact", "a fact", "3 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: (((((("d_ facto") OR ((("d3 facts") OR ("23 facts"))))) OR ("e fact"))) OR ("da factor")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"d_ facto\") or (((\"d3 facts\") OR (\"23 facts\"))))) or (\"e fact\"))) or (\"da factor\"))".
• Removing quotes may allow a broader search: (((((( d_ facto ) or ((( d3 facts ) OR ( 23 facts ))))) or ( e fact ))) or ( da factor )).
• Adding a wildcard symbol may retrieve word variants: (((((("d_ facto") or ((("d3 facts") OR ("23 facts"))))) or ("e fact"))) or ("da factor"))*.