Talvez deva tentar algumas variações de ortografia:
mental research » dental research (Expandir a Pesquisa), central research (Expandir a Pesquisa), neonatal research (Expandir a Pesquisa)
research system » research systems (Expandir a Pesquisa)
recent nerve » prevent nerve (Expandir a Pesquisa), rodent nerve (Expandir a Pesquisa), recurrent nerve (Expandir a Pesquisa)
system dis » system dias (Expandir a Pesquisa), system dcs (Expandir a Pesquisa), system di (Expandir a Pesquisa)
nerve can » nerve canal (Expandir a Pesquisa), nerve case (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
ai recent » ii recent (Expandir a Pesquisa), oi recent (Expandir a Pesquisa), acid recent (Expandir a Pesquisa)
nerve cat » nerve case (Expandir a Pesquisa), nerve a (Expandir a Pesquisa), nerve c (Expandir a Pesquisa)
i recent » ii recent (Expandir a Pesquisa), iii recent (Expandir a Pesquisa)
j mental » j mengual (Expandir a Pesquisa), j mena (Expandir a Pesquisa), j mehta (Expandir a Pesquisa)
can die » can diet (Expandir a Pesquisa), van die (Expandir a Pesquisa), aan die (Expandir a Pesquisa)
cat dis » cat did (Expandir a Pesquisa), cat diets (Expandir a Pesquisa), cat diet (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: (((( i recent nerve can die ) or ( ai recent nerve cat dis ))) or ( j mental research system dis ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( i recent nerve can die ) OR ( ai recent nerve cat dis ))) OR ( j mental research system dis )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( i recent nerve can die ) or ( ai recent nerve cat dis ))) or ( j mental research system dis ))*.