Perhaps you should try some spelling variations:
"case centennial medal" » "case centennial year", "case centennial man", "case centennial decade", "issue centennial medal", "a centennial medal", "its centennial medal"
"his centennial medal" » "his centennial year", "his centennial man", "his centennial decade", "its centennial medal", "_ centennial medal", "a centennial medal"

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: "((\"case centennial medal\") OR (\"his centennial medal\"))".
• Removing quotes may allow a broader search: (( case centennial medal ) OR ( his centennial medal )).
• Adding a wildcard symbol may retrieve word variants: (("case centennial medal") OR ("his centennial medal"))*.