Talvez deva tentar algumas variações de ortografia:
research system » research systems (Expandir a Pesquisa)
renal research » retinal research (Expandir a Pesquisa), dental research (Expandir a Pesquisa), regional research (Expandir a Pesquisa)
centner nerve » central nerve (Expandir a Pesquisa), cancer nerve (Expandir a Pesquisa), letter nerve (Expandir a Pesquisa)
mental nerve » ventral nerve (Expandir a Pesquisa), renal nerve (Expandir a Pesquisa)
j centner » j center (Expandir a Pesquisa), m centner (Expandir a Pesquisa), _ entner (Expandir a Pesquisa)
nerve aan » nerve can (Expandir a Pesquisa), nerve aen (Expandir a Pesquisa), nerve axon (Expandir a Pesquisa)
system de » system der (Expandir a Pesquisa), system delay (Expandir a Pesquisa)
i mental » vi mental (Expandir a Pesquisa), ii mental (Expandir a Pesquisa), i metal (Expandir a Pesquisa)
aan dis » aan die (Expandir a Pesquisa), van dis (Expandir a Pesquisa), dan dis (Expandir a Pesquisa)
nerve a » nerve _ (Expandir a Pesquisa)
j renal » j real (Expandir a Pesquisa), j renaldi (Expandir a Pesquisa), j renato (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: (((( j centner nerve aan dis ) or ( i mental nerve a dis ))) or ( j renal research system de ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j centner nerve aan dis ) OR ( i mental nerve a dis ))) OR ( j renal research system de )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j centner nerve aan dis ) or ( i mental nerve a dis ))) or ( j renal research system de ))*.