Talvez deva tentar algumas variações de ortografia:
best observed » best served (Expandir a Pesquisa), event observed (Expandir a Pesquisa), first observed (Expandir a Pesquisa)
observed case » observed data (Expandir a Pesquisa), observed a (Expandir a Pesquisa), observed increase (Expandir a Pesquisa)
current clip » current clamp (Expandir a Pesquisa), current clamps (Expandir a Pesquisa), current clinic (Expandir a Pesquisa)
clip system » chip system (Expandir a Pesquisa), chip systems (Expandir a Pesquisa)
cent nerve » bent nerve (Expandir a Pesquisa), recent nerve (Expandir a Pesquisa), crest nerve (Expandir a Pesquisa)
nerve flap » nerve fat (Expandir a Pesquisa)
case dti » case data (Expandir a Pesquisa), based dti (Expandir a Pesquisa), case due (Expandir a Pesquisa)
flap de » flap due (Expandir a Pesquisa), flap does (Expandir a Pesquisa), flap dna (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.

• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( i cent nerve flap de ) OR ( i current clip system der ))) OR ( j best observed case dti ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( i cent nerve flap de ) or ( i current clip system der ))) or ( j best observed case dti ))*.