Talvez deva tentar algumas variações de ortografia:
center nurse » center nurses (Expandir a Pesquisa), letter nurse (Expandir a Pesquisa), cancer nurse (Expandir a Pesquisa)
nurse system » course system (Expandir a Pesquisa), pulse system (Expandir a Pesquisa), purpose system (Expandir a Pesquisa)
system dgps » system gps (Expandir a Pesquisa), system des (Expandir a Pesquisa), system dcs (Expandir a Pesquisa)
benign nevi » benign neck (Expandir a Pesquisa)
a ventral » _ ventral (Expandir a Pesquisa), a ventura (Expandir a Pesquisa)
nevi cyst » nevi case (Expandir a Pesquisa), nevi cns (Expandir a Pesquisa)
j center » j centner (Expandir a Pesquisa), j centeno (Expandir a Pesquisa), j cestero (Expandir a Pesquisa)
j benign » j benigno (Expandir a Pesquisa), _ benign (Expandir a Pesquisa), a benign (Expandir a Pesquisa)
eye can » eye care (Expandir a Pesquisa)
can dcs » can tdcs (Expandir a Pesquisa), can dce (Expandir a Pesquisa), can dags (Expandir a Pesquisa)
cyst d » cyst _ (Expandir a Pesquisa), cyst a (Expandir a Pesquisa), cyst e (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(((( j center nurse system dgps ) OR ( a ventral eye can dcs ))) OR ( j benign nevi cyst d ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j center nurse system dgps ) OR ( a ventral eye can dcs ))) OR ( j benign nevi cyst d ))*.