Perhaps you should try some spelling variations:
"15 factor" » "15 factors", "12 factor", "5 factor"
"de facon" » "de facto", "de falco", "la facon"
"3 factor" » "3 factors", "13 factors", "3 facts", "3 factsor", "3 fastor"
"de fact" » "de facto", "de fait", "de falco", "d_ fact", "da fact", "d5 fact"
"da fact" » "a fact", "data fact", "can fact"
"e fact" » "_ fact", "a fact", "5 fact"
"3 fact" » "3 facts", "3 fast"

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: (((("15 factor") OR ("de facon"))) OR ((((("de fact") OR ("da fact"))) OR ((("e fact") OR ((((("3 fact") OR ("3 factor"))) OR ("3 face")))))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"15 factor\") or (\"de facon\"))) or (((((\"de fact\") or (\"da fact\"))) or (((\"e fact\") or (((((\"3 fact\") OR (\"3 factor\"))) or (\"3 face\"))))))))".
• Removing quotes may allow a broader search: (((( 15 factor ) or ( de facon ))) or ((((( de fact ) or ( da fact ))) or ((( e fact ) or ((((( 3 fact ) OR ( 3 factor ))) or ( 3 face )))))))).
• Adding a wildcard symbol may retrieve word variants: (((("15 factor") or ("de facon"))) or ((((("de fact") or ("da fact"))) or ((("e fact") or ((((("3 fact") OR ("3 factor"))) or ("3 face"))))))))*.