Perhaps you should try some spelling variations:
"frederick howard piers" » "frederick lord piers", "frederick howard ayers", "frederick howard pyle's", "frederick howard ira"
"frederick henry percy" » "frederick earl percy", "frederick handel percy", "frederick george percy", "frederick henry petty", "frederick henry penrice", "frederick henry purcel"

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: (("frederick henry percy") OR ("frederick howard piers")).
• Removing quotes may allow a broader search: (( frederick henry percy ) or ( frederick howard piers )).
• Adding a wildcard symbol may retrieve word variants: (("frederick henry percy") or ("frederick howard piers"))*.