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