Talvez deva tentar algumas variações de ortografia:
research systems » research synthesis (Expandir a Pesquisa)
mental research » dental research (Expandir a Pesquisa), central research (Expandir a Pesquisa), neonatal research (Expandir a Pesquisa)
century survey » center survey (Expandir a Pesquisa), centre survey (Expandir a Pesquisa), country survey (Expandir a Pesquisa)
survey can » survey scan (Expandir a Pesquisa), survey chns (Expandir a Pesquisa), survey com (Expandir a Pesquisa)
cent nerve » bent nerve (Expandir a Pesquisa), recent nerve (Expandir a Pesquisa), crest nerve (Expandir a Pesquisa)
systems di » systems do (Expandir a Pesquisa), systems de (Expandir a Pesquisa), systems d (Expandir a Pesquisa)
j mental » j mengual (Expandir a Pesquisa), j mena (Expandir a Pesquisa), j mehta (Expandir a Pesquisa)
can dcs » can tdcs (Expandir a Pesquisa), can dce (Expandir a Pesquisa), can dags (Expandir a Pesquisa)
i cent » i cento (Expandir a Pesquisa), ai cent (Expandir a Pesquisa), ii cent (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 century survey can dcs ) or ( i cent nerve _ dis ))) or ( j mental research systems di ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( a century survey can dcs ) OR ( i cent nerve _ dis ))) OR ( j mental research systems di )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( a century survey can dcs ) or ( i cent nerve _ dis ))) or ( j mental research systems di ))*.