Talvez deva tentar algumas variações de ortografia:
research systems » research synthesis (Expandir a Pesquisa)
media research » medical research (Expandir a Pesquisa), meta research (Expandir a Pesquisa), medicine research (Expandir a Pesquisa)
recent nerve » prevent nerve (Expandir a Pesquisa), rodent nerve (Expandir a Pesquisa), recurrent nerve (Expandir a Pesquisa)
center merve » center more (Expandir a Pesquisa), center servers (Expandir a Pesquisa), center service (Expandir a Pesquisa)
systems de » systems do (Expandir a Pesquisa), systems mems (Expandir a Pesquisa), systems data (Expandir a Pesquisa)
merve can » nerve can (Expandir a Pesquisa)
j center » j centner (Expandir a Pesquisa), j centeno (Expandir a Pesquisa), j cestero (Expandir a Pesquisa)
i recent » ii recent (Expandir a Pesquisa), iii recent (Expandir a Pesquisa)
can dis » can disc (Expandir a Pesquisa), van dis (Expandir a Pesquisa), can die (Expandir a Pesquisa)
nerve c » nerve cn (Expandir a Pesquisa), nerve _ (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
a media » a medina (Expandir a Pesquisa), a medida (Expandir a Pesquisa), a medical (Expandir a Pesquisa)
c dos » e dos (Expandir a Pesquisa), a dos (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j center merve can dis ) OR ( i recent nerve c dos ))) OR ( a media research systems de ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j center merve can dis ) or ( i recent nerve c dos ))) or ( a media research systems de ))*.