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 sarah" » "brian duncan adam", "brian duncan gray", "brian duncan shaw", "bruce duncan sarah", "bra duncan sarah", "brjon duncan sarah", "brinnes duncan sarah"
"ian duncan smith" » "ian duncan sir", "ian duncan scott", "a duncan smith", "jon duncan smith", "innes duncan smith"

You may be able to get more results by adjusting your search query.

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