Perhaps you should try some spelling variations:
"brian duncan smith" » "brian duncan sarah", "brian duncan scott", "bra duncan smith", "brjon duncan smith", "brinnes duncan smith"
"bruce duncan smith" » "bruce duncan sarah", "bruce duncan scott"
"ian duncan sir" » "a 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: (("ian duncan sir") OR ((("brian duncan smith") OR ("bruce duncan smith")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"ian duncan sir\") or (((\"brian duncan smith\") OR (\"bruce duncan smith\"))))".
• Removing quotes may allow a broader search: (( ian duncan sir ) or ((( brian duncan smith ) OR ( bruce duncan smith )))).
• Adding a wildcard symbol may retrieve word variants: (("ian duncan sir") or ((("brian duncan smith") OR ("bruce duncan smith"))))*.