Perhaps you should try some spelling variations:
"william smithers peter" » "william smith's peter", "william smith peter", "william saunders peter", "william deiters peter", "william others peter"
"william rivers letter" » "william rider letter", "william ryves letter", "william rogers letter", "william divers letter", "william divers letters", "william writers letter"

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: (("william rivers letter") OR ("william smithers peter")).
• Removing quotes may allow a broader search: (( william rivers letter ) or ( william smithers peter )).
• Adding a wildcard symbol may retrieve word variants: (("william rivers letter") or ("william smithers peter"))*.