Talvez deva tentar algumas variações de ortografia:
research systems » research synthesis (Expandir a Pesquisa)
renal research » regional research (Expandir a Pesquisa), orginal research (Expandir a Pesquisa), spinal research (Expandir a Pesquisa)
mental nerve » ventral nerve (Expandir a Pesquisa), central nerve (Expandir a Pesquisa), renal nerve (Expandir a Pesquisa)
center nerve » cancer nerve (Expandir a Pesquisa), center nurse (Expandir a Pesquisa), letter nerve (Expandir a Pesquisa)
systems di » systems do (Expandir a Pesquisa), systems de (Expandir a Pesquisa), systems d (Expandir a Pesquisa)
nerve _an » nerve can (Expandir a Pesquisa), nerve a (Expandir a Pesquisa), nerve cat (Expandir a Pesquisa)
j center » j centner (Expandir a Pesquisa), j centeno (Expandir a Pesquisa), j cestero (Expandir a Pesquisa)
i mental » vi mental (Expandir a Pesquisa), ii mental (Expandir a Pesquisa), i metal (Expandir a Pesquisa)
_an dis » van dis (Expandir a Pesquisa), dan dis (Expandir a Pesquisa), olan dis (Expandir a Pesquisa)
j renal » j real (Expandir a Pesquisa), j renaldi (Expandir a Pesquisa), j renato (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 _an dis ) or ( i mental nerve _ dis ))) or ( j renal research systems di ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j center nerve _an dis ) OR ( i mental nerve _ dis ))) OR ( j renal research systems di )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j center nerve _an dis ) or ( i mental nerve _ dis ))) or ( j renal research systems di ))*.