Talvez deva tentar algumas variações de ortografia:
mental nerve » ventral nerve (Expandir a Pesquisa), central nerve (Expandir a Pesquisa)
current cave » current care (Expandir a Pesquisa), current wave (Expandir a Pesquisa), current case (Expandir a Pesquisa)
cave system » wave system (Expandir a Pesquisa), caste system (Expandir a Pesquisa), valve system (Expandir a Pesquisa)
delta nerve » beta nerve (Expandir a Pesquisa), deltoid nerve (Expandir a Pesquisa), deltas served (Expandir a Pesquisa)
nerve cause » nerve caused (Expandir a Pesquisa), nerve case (Expandir a Pesquisa), nerve course (Expandir a Pesquisa)
system dcs » system dcus (Expandir a Pesquisa), system sdcs (Expandir a Pesquisa), system des (Expandir a Pesquisa)
ii mental » ii metal (Expandir a Pesquisa), vi mental (Expandir a Pesquisa), mini mental (Expandir a Pesquisa)
nerve cat » nerve can (Expandir a Pesquisa), nerve case (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
cat diet » cat diets (Expandir a Pesquisa), fat diet (Expandir a Pesquisa), eat diet (Expandir a Pesquisa)
cause di » cause de (Expandir a Pesquisa), cause du (Expandir a Pesquisa), cause d (Expandir a Pesquisa)
j delta » j della (Expandir a Pesquisa), j delton (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": "(((( ii mental nerve cat diet ) OR ( i current cave system dcs ))) OR ( j delta nerve cause di ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( ii mental nerve cat diet ) OR ( i current cave system dcs ))) OR ( j delta nerve cause di ))*.