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)
benth nerve » bent nerve (Expandir a Pesquisa), both nerve (Expandir a Pesquisa), seventh nerve (Expandir a Pesquisa)
systems di » systems do (Expandir a Pesquisa), systems de (Expandir a Pesquisa), systems d (Expandir a Pesquisa)
j centner » j center (Expandir a Pesquisa), m centner (Expandir a Pesquisa), _ entner (Expandir a Pesquisa)
merve can » nerve can (Expandir a Pesquisa)
j mental » j mengual (Expandir a Pesquisa), j mehta (Expandir a Pesquisa), j mena (Expandir a Pesquisa)
can dcs » can tdcs (Expandir a Pesquisa), can dce (Expandir a Pesquisa), can dags (Expandir a Pesquisa)
i benth » l benth (Expandir a Pesquisa), ex benth (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 centner merve can dcs ) or ( i benth nerve _ dis ))) or ( j mental research systems di ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j centner merve can dcs ) OR ( i benth nerve _ dis ))) OR ( j mental research systems di )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j centner merve can dcs ) or ( i benth nerve _ dis ))) or ( j mental research systems di ))*.