Talvez deva tentar algumas variações de ortografia:
observed cases » observed case (Expandir a Pesquisa), observed care (Expandir a Pesquisa), unobserved causes (Expandir a Pesquisa)
event observed » events observed (Expandir a Pesquisa), effect observed (Expandir a Pesquisa), fever observed (Expandir a Pesquisa)
crest serve » crest nerve (Expandir a Pesquisa), best serve (Expandir a Pesquisa), crest derived (Expandir a Pesquisa)
beare serve » beaupre serge (Expandir a Pesquisa), bearer serum (Expandir a Pesquisa)
serve cat » nerve cat (Expandir a Pesquisa), serve a (Expandir a Pesquisa), service cats (Expandir a Pesquisa)
cases dis » cases did (Expandir a Pesquisa), cases dos (Expandir a Pesquisa), cases does (Expandir a Pesquisa)
cat dis » cat did (Expandir a Pesquisa), cat diets (Expandir a Pesquisa), cat diet (Expandir a Pesquisa)
j beare » j beard (Expandir a Pesquisa), _ beare (Expandir a Pesquisa), j beale (Expandir a Pesquisa)
j event » i event (Expandir a Pesquisa), bp event (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: (( _ crest serve cat dis ) or ((( j beare serve cat dis ) or ( j event observed cases dis ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( _ crest serve cat dis ) OR ((( j beare serve cat dis ) OR ( j event observed cases dis )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( _ crest serve cat dis ) or ((( j beare serve cat dis ) or ( j event observed cases dis ))))*.