Perhaps you should try some spelling variations:
"a.h brown" » "g.h brown", "nach brown", "a brown"
"a.r brown" » "j.r brown", "e.a.r brown", "fair brown"
"a.b brown" » "4.4 brown", "6.6 brown", "6.8 brown"
"2.2 brown" » "12 brown", "2.2 brain", "2.2 broy"

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: (((("a.h brown") OR ("a.r brown"))) OR ((("a.b brown") OR ("2.2 brown")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"a.h brown\") OR (\"a.r brown\"))) or (((\"a.b brown\") or (\"2.2 brown\"))))".
• Removing quotes may allow a broader search: (((( a.h brown ) OR ( a.r brown ))) or ((( a.b brown ) or ( 2.2 brown )))).
• Adding a wildcard symbol may retrieve word variants: (((("a.h brown") OR ("a.r brown"))) or ((("a.b brown") or ("2.2 brown"))))*.