Perhaps you should try some spelling variations:
"dose factor" » "noise factor", "one factor", "mode factor"
"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 faito" » "de facto", "de fait", "de faits"
"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 ("dose factor"))) OR ("de faito"))) OR ("de fact")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((((\"de factoor\") OR (\"de facteur\"))) or (\"dose factor\"))) or (\"de faito\"))) or (\"de fact\"))".
• Removing quotes may allow a broader search: (((((((( de factoor ) OR ( de facteur ))) or ( dose factor ))) or ( de faito ))) or ( de fact )).
• Adding a wildcard symbol may retrieve word variants: (((((((("de factoor") OR ("de facteur"))) or ("dose factor"))) or ("de faito"))) or ("de fact"))*.