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 m" » "bra duncan m", "brjon duncan m", "brinnes duncan m", "brian duncan _", "brian duncan m.d"
"bruce duncan m" » "bruce duncan _", "bruce duncan m.d"

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