Perhaps you should try some spelling variations:
"de factoor" » "de facto", "de facteur", "de factooor", "de faitoor", "e factoor"
"de falcoo" » "de falco", "die falcon", "de facto"
"de factor" » "de facto", "e factor", "dose factor", "de factoor", "de faitor"
"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: (((("de falcoo") OR ("de fact"))) OR ((("de factor") OR ("de factoor")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"de falcoo\") or (\"de fact\"))) or (((\"de factor\") OR (\"de factoor\"))))".
• Removing quotes may allow a broader search: (((( de falcoo ) or ( de fact ))) or ((( de factor ) OR ( de factoor )))).
• Adding a wildcard symbol may retrieve word variants: (((("de falcoo") or ("de fact"))) or ((("de factor") OR ("de factoor"))))*.