Talvez deva tentar algumas variações de ortografia:
research systems » research synthesis (Expandir a Pesquisa)
mentz research » mental research (Expandir a Pesquisa), men research (Expandir a Pesquisa), cement research (Expandir a Pesquisa)
center nerve » cancer nerve (Expandir a Pesquisa), center nurse (Expandir a Pesquisa), letter nerve (Expandir a Pesquisa)
nerve coast » nerve case (Expandir a Pesquisa), nerve cat (Expandir a Pesquisa), nerve crash (Expandir a Pesquisa)
systems dis » systems disk (Expandir a Pesquisa), systems dss (Expandir a Pesquisa), systems dds (Expandir a Pesquisa)
cent nerve » bent nerve (Expandir a Pesquisa), recent nerve (Expandir a Pesquisa), crest nerve (Expandir a Pesquisa)
coast did » coast air (Expandir a Pesquisa), coast de (Expandir a Pesquisa), coast big (Expandir a Pesquisa)
a center » a century (Expandir a Pesquisa)
nerve c » nerve cn (Expandir a Pesquisa), nerve co (Expandir a Pesquisa), nerve ct (Expandir a Pesquisa)
j mentz » j mentzer (Expandir a Pesquisa), j mendez (Expandir a Pesquisa)
i cent » i cento (Expandir a Pesquisa), ai cent (Expandir a Pesquisa), ii cent (Expandir a Pesquisa)
c dis » c dias (Expandir a Pesquisa), c disc (Expandir a Pesquisa), c dos (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: (((( a center nerve coast did ) or ( i cent nerve c dis ))) or ( j mentz research systems dis ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( a center nerve coast did ) OR ( i cent nerve c dis ))) OR ( j mentz research systems dis )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( a center nerve coast did ) or ( i cent nerve c dis ))) or ( j mentz research systems dis ))*.