Perhaps you should try some spelling variations:
"united potter postmaster general" » "united potter paymaster general", "united potter westminster general", "united potter master general", "united after postmaster general", "united powers postmaster general", "united paper postmaster general"
"named potter postmaster general" » "named potter paymaster general", "named potter westminster general", "named potter master general", "james potter postmaster general", "named after postmaster general", "names matter postmaster general"

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: "((\"united potter postmaster general\") OR (\"named potter postmaster general\"))".
• Removing quotes may allow a broader search: (( united potter postmaster general ) OR ( named potter postmaster general )).
• Adding a wildcard symbol may retrieve word variants: (("united potter postmaster general") OR ("named potter postmaster general"))*.