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)
cent nerve » bent nerve (Expandir a Pesquisa), recent nerve (Expandir a Pesquisa), crest nerve (Expandir a Pesquisa)
systems di » systems doi (Expandir a Pesquisa), systems do (Expandir a Pesquisa), systems de (Expandir a Pesquisa)
nerve aat » nerve 3t (Expandir a Pesquisa), nerve aen (Expandir a Pesquisa), nerve age (Expandir a Pesquisa)
aat dis » rat disc (Expandir a Pesquisa), laat die (Expandir a Pesquisa)
nerve a » nerve _ (Expandir a Pesquisa)
j cent » a cent (Expandir a Pesquisa), j center (Expandir a Pesquisa)
i cent » i cento (Expandir a Pesquisa), ai cent (Expandir a Pesquisa), ii cent (Expandir a Pesquisa)
a disc » a dish (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 cent nerve aat dis ) or ( i cent nerve a disc ))) or ( a mehta research systems di ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j cent nerve aat dis ) OR ( i cent nerve a disc ))) OR ( a mehta research systems di )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j cent nerve aat dis ) or ( i cent nerve a disc ))) or ( a mehta research systems di ))*.