Talvez deva tentar algumas variações de ortografia:
recurrent severe » recurrent fever (Expandir a Pesquisa), recurrent seizures (Expandir a Pesquisa), recurrent stroke (Expandir a Pesquisa)
current nerve » recurrent nerve (Expandir a Pesquisa), current curve (Expandir a Pesquisa), recurrent nerves (Expandir a Pesquisa)
severe cost » severe post (Expandir a Pesquisa), severe cast (Expandir a Pesquisa), severe frost (Expandir a Pesquisa)
mehta nerve » mehta nave (Expandir a Pesquisa), mehta nee (Expandir a Pesquisa), mehta neeraj (Expandir a Pesquisa)
nerve cyst » nerve case (Expandir a Pesquisa), nerve cat (Expandir a Pesquisa), nerve system (Expandir a Pesquisa)
j current » j currently (Expandir a Pesquisa), j curran (Expandir a Pesquisa), j currell (Expandir a Pesquisa)
cost dis » cost does (Expandir a Pesquisa), chest dis (Expandir a Pesquisa), cost aids (Expandir a Pesquisa)
nerve a » nerve _ (Expandir a Pesquisa)
a dos » e dos (Expandir a Pesquisa), a dog (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(((( j current nerve a dos ) OR ( _ recurrent severe cost dis ))) OR ( a mehta nerve cyst due ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j current nerve a dos ) OR ( _ recurrent severe cost dis ))) OR ( a mehta nerve cyst due ))*.