Perhaps you should try some spelling variations:
"ian duncan sarah" » "ian duncan adam", "ian duncan shaw", "ian duncan sir", "brian duncan sarah", "jon duncan sarah", "innes duncan sarah"
"a duncan smith" » "a duncan sir", "a duncan scott", "ra duncan smith", "j duncan smith", "m duncan smith"
"_ duncan smith" » "_ duncan sir", "_ duncan scott", "_ dunciad smith"
"ian duncan gray" » "ian duncan grant", "ian duncan green", "brian duncan gray", "jon duncan gray", "innes duncan gray"

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