Perhaps you should try some spelling variations:
threat nerve » treat nerve (Expand Search), threat never (Expand Search), three nerve (Expand Search)
nerve system » nervous system (Expand Search), drive system (Expand Search)
benzo nerve » bent nerve (Expand Search), benign nerve (Expand Search)
system dis » system dias (Expand Search), system dcs (Expand Search), system dds (Expand Search)
real nerve » reveal nerve (Expand Search), fetal nerve (Expand Search), oral nerve (Expand Search)
nerve can » nerve canal (Expand Search), nerve case (Expand Search), nerve a (Expand Search)
j threat » _ threat (Expand Search), a threat (Expand Search), 2 threat (Expand Search)
can dcs » can tdcs (Expand Search), can dce (Expand Search), can bddcs (Expand Search)
j benzo » j bento (Expand Search), j benito (Expand Search), j benton (Expand Search)
i real » i really (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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( j threat nerve system dis ) OR ( i real nerve can dcs ))) OR ( j benzo nerve system dis ))~".
• Adding a wildcard symbol may retrieve word variants: (((( j threat nerve system dis ) OR ( i real nerve can dcs ))) OR ( j benzo nerve system dis ))*.