Perhaps you should try some spelling variations:
"ian duncan sarah" » "ian duncan adam", "ian duncan gray", "ian duncan shaw", "a duncan sarah", "jon duncan sarah", "innes duncan sarah"
"brian duncan sir" » "bra duncan sir", "brjon duncan sir", "brinnes duncan sir", "brian duncan i"
"bruce duncan sir" » "bruce duncan i"

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