Talvez deva tentar algumas variações de ortografia:
fever nursing » fever during (Expandir a Pesquisa), fever using (Expandir a Pesquisa), level nursing (Expandir a Pesquisa)
letter nerve » letter nurse (Expandir a Pesquisa), matter nerve (Expandir a Pesquisa), letter nervous (Expandir a Pesquisa)
nursing cost » nursing costs (Expandir a Pesquisa), nursing lost (Expandir a Pesquisa), nursing coat (Expandir a Pesquisa)
nerve cause » nerve caused (Expandir a Pesquisa), nerve case (Expandir a Pesquisa), nerve course (Expandir a Pesquisa)
bj letter » bj letters (Expandir a Pesquisa), b.j letters (Expandir a Pesquisa), _ letter (Expandir a Pesquisa)
cost aids » post aids (Expandir a Pesquisa), costa aida (Expandir a Pesquisa), count aids (Expandir a Pesquisa)
cause dis » cause disc (Expandir a Pesquisa), cause des (Expandir a Pesquisa), cause di (Expandir a Pesquisa)
nerve n » nerve na (Expandir a Pesquisa), nerve _ (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
a fever » _ fever (Expandir a Pesquisa)
n diet » n diez (Expandir a Pesquisa), n dief (Expandir a Pesquisa), n dien (Expandir a Pesquisa)
j beta » j beth (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": "(((( bj letter nerve n diet ) OR ( a fever nursing cost aids ))) OR ( j beta nerve cause dis ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( bj letter nerve n diet ) OR ( a fever nursing cost aids ))) OR ( j beta nerve cause dis ))*.