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

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 smith"))) OR ("a duncan sir")).
• Removing quotes may allow a broader search: (((( ian duncan sarah ) or ( brian duncan smith ))) or ( a duncan sir )).
• Adding a wildcard symbol may retrieve word variants: (((("ian duncan sarah") or ("brian duncan smith"))) or ("a duncan sir"))*.