Talvez deva tentar algumas variações de ortografia:
research systems » research synthesis (Expandir a Pesquisa)
mehta research » meta research (Expandir a Pesquisa), beta research (Expandir a Pesquisa), feta research (Expandir a Pesquisa)
central nerve » ventral nerve (Expandir a Pesquisa), central nervous (Expandir a Pesquisa), central neural (Expandir a Pesquisa)
systems dan » systems dean (Expandir a Pesquisa), systems das (Expandir a Pesquisa), systems data (Expandir a Pesquisa)
pain nerve » brain nerve (Expandir a Pesquisa), main nerves (Expandir a Pesquisa), skin nerve (Expandir a Pesquisa)
m central » em central (Expandir a Pesquisa), arm central (Expandir a Pesquisa), qom central (Expandir a Pesquisa)
nerve _at » nerve cat (Expandir a Pesquisa), nerve a (Expandir a Pesquisa), nerve can (Expandir a Pesquisa)
_at did » cat did (Expandir a Pesquisa), what did (Expandir a Pesquisa), fast did (Expandir a Pesquisa)
j mehta » a mehta (Expandir a Pesquisa), _ mehta (Expandir a Pesquisa), k mehta (Expandir a Pesquisa)
i pain » i paint (Expandir a Pesquisa), ii pain (Expandir a Pesquisa), i panina (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: (((( m central nerve _at did ) or ( i pain nerve _ dis ))) or ( j mehta research systems dan ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( m central nerve _at did ) OR ( i pain nerve _ dis ))) OR ( j mehta research systems dan )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( m central nerve _at did ) or ( i pain nerve _ dis ))) or ( j mehta research systems dan ))*.