Perhaps you should try some spelling variations:
letter nerve » letter nurse (Expand Search), matter nerve (Expand Search), letter nervous (Expand Search)
delta nerve » beta nerve (Expand Search), deltoid nerve (Expand Search), deltas served (Expand Search)
nerve cyst » nerve cystic (Expand Search), nerve case (Expand Search), nerve cat (Expand Search)
help nerve » help nerves (Expand Search), helps nerve (Expand Search), held nerve (Expand Search)
nerve can » nerve canal (Expand Search), nerve case (Expand Search), nerve a (Expand Search)
j letter » bj letter (Expand Search), cj letter (Expand Search), j letters (Expand Search)
cyst dis » cyst due (Expand Search), cyst d (Expand Search), cyst dna (Expand Search)
can dis » can disc (Expand Search), van dis (Expand Search), can die (Expand Search)
j delta » j della (Expand Search), j delton (Expand Search), j deluca (Expand Search)
a help » a held (Expand Search), a helper (Expand Search)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((( j letter nerve cyst dis ) or ( a help nerve can dis ))) or ( j delta nerve cyst dis ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( j letter nerve cyst dis ) OR ( a help nerve can dis ))) OR ( j delta nerve cyst dis )).
• Adding a wildcard symbol may retrieve word variants: (((( j letter nerve cyst dis ) or ( a help nerve can dis ))) or ( j delta nerve cyst dis ))*.