Talvez deva tentar algumas variações de ortografia:
current observed » currents observed (Expandir a Pesquisa), currents observer (Expandir a Pesquisa), current reserve (Expandir a Pesquisa)
observed system » conserved system (Expandir a Pesquisa), unobserved systems (Expandir a Pesquisa), observing system (Expandir a Pesquisa)
current nerve » recurrent nerve (Expandir a Pesquisa), current service (Expandir a Pesquisa), current survey (Expandir a Pesquisa)
19 current » ac current (Expandir a Pesquisa)
system dis » system dias (Expandir a Pesquisa), system dcs (Expandir a Pesquisa), system di (Expandir a Pesquisa)
bent nerve » absent nerve (Expandir a Pesquisa), mental nerve (Expandir a Pesquisa), dental nerve (Expandir a Pesquisa)
nerve cyst » nerve case (Expandir a Pesquisa), nerve cat (Expandir a Pesquisa), nerve cut (Expandir a Pesquisa)
nerve a » nerve _ (Expandir a Pesquisa)
j bent » j benet (Expandir a Pesquisa), j bento (Expandir a Pesquisa), j bena (Expandir a Pesquisa)
a dis » a dos (Expandir a Pesquisa), a des (Expandir a Pesquisa), a dia (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Performing a fuzzy search may retrieve terms with similar spellings: (((( 19 current nerve a dis ) or ( 2 current observed system dis ))) or ( j bent nerve cyst due ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( 19 current nerve a dis ) OR ( 2 current observed system dis ))) OR ( j bent nerve cyst due )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( 19 current nerve a dis ) or ( 2 current observed system dis ))) or ( j bent nerve cyst due ))*.