Perhaps you should try some spelling variations:
"a duncan smith" » "a duncan sarah", "ra duncan smith", "_ duncan smith", "j duncan smith"
"a duncan scott" » "a duncan scotus", "a duncan stone", "ra duncan scott", "_ duncan scott", "j duncan scott"
"brian duncan sir" » "bruce duncan sir", "brjon duncan sir", "brinnes duncan sir", "brian duncan i", "brian duncan sarah"
"ian duncan shaw" » "ian duncan sarah", "jon duncan shaw", "innes duncan shaw"
"ian duncan sir" » "jon duncan sir", "innes duncan sir", "ian duncan i", "ian duncan sarah"

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