Perhaps you should try some spelling variations:
"jon duncan scotus" » "jon duns scotus", "j duncan scotus", "ian duncan scotus", "colin duncan scotus"
"john duncan smith" » "john duncan sarah", "john duncan sir", "john dunton smith", "john dunning smith"
"john duncan scott" » "john duncan stone", "john dunton scott", "john dunning scott"

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: (((("john duncan smith") OR ("john duncan scott"))) OR ("jon duncan scotus")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"john duncan smith\") OR (\"john duncan scott\"))) or (\"jon duncan scotus\"))".
• Removing quotes may allow a broader search: (((( john duncan smith ) OR ( john duncan scott ))) or ( jon duncan scotus )).
• Adding a wildcard symbol may retrieve word variants: (((("john duncan smith") OR ("john duncan scott"))) or ("jon duncan scotus"))*.