Talvez deva tentar algumas variações de ortografia:
absent negative » absent native (Expandir a Pesquisa), absent negativity (Expandir a Pesquisa), patient negative (Expandir a Pesquisa)
central nerve » ventral nerve (Expandir a Pesquisa), central nervous (Expandir a Pesquisa), central neural (Expandir a Pesquisa)
negative cyst » negative chest (Expandir a Pesquisa), negative cis (Expandir a Pesquisa), negative case (Expandir a Pesquisa)
center nerve » cancer nerve (Expandir a Pesquisa), center nurse (Expandir a Pesquisa), letter nerve (Expandir a Pesquisa)
nerve cyst » nerve case (Expandir a Pesquisa), nerve cat (Expandir a Pesquisa), nerve system (Expandir a Pesquisa)
i central » coli central (Expandir a Pesquisa), hemi central (Expandir a Pesquisa)
j center » j centner (Expandir a Pesquisa), _ center (Expandir a Pesquisa), a center (Expandir a Pesquisa)
_ absent » _ absence (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: (((( j center nerve cyst due ) or ( i central nerve cyst dis ))) or ( _ absent negative cyst dis ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j center nerve cyst due ) OR ( i central nerve cyst dis ))) OR ( _ absent negative cyst dis )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j center nerve cyst due ) or ( i central nerve cyst dis ))) or ( _ absent negative cyst dis ))*.