Perhaps you should try some spelling variations:
"da factor" » "a factor", "data factor", "rdna factor", "da faceor", "da factoror"
"de fact" » "de facto", "de fait", "de falco", "d_ fact", "d3 fact", "d5 fact"
"e fact" » "_ fact", "3 fact", "5 fact"
"a fact" » "a face", "a factor"

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