Talvez deva tentar algumas variações de ortografia:
observed cases » observed case (Expandir a Pesquisa), observed care (Expandir a Pesquisa), unobserved causes (Expandir a Pesquisa)
crest derived » host derived (Expandir a Pesquisa)
best observed » best served (Expandir a Pesquisa), event observed (Expandir a Pesquisa)
derived cat » derived cast (Expandir a Pesquisa), derived car (Expandir a Pesquisa), derived ca (Expandir a Pesquisa)
beare nerve » beaded nerve (Expandir a Pesquisa), care nerve (Expandir a Pesquisa), rare nerve (Expandir a Pesquisa)
cases dis » cases did (Expandir a Pesquisa), cases dos (Expandir a Pesquisa), cases does (Expandir a Pesquisa)
case dis » case disc (Expandir a Pesquisa), case di (Expandir a Pesquisa), case 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)

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 derived cat dis ) or ((( j beare nerve case dis ) or ( j best observed cases dis ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( _ crest derived cat dis ) OR ((( j beare nerve case dis ) OR ( j best observed cases dis )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( _ crest derived cat dis ) or ((( j beare nerve case dis ) or ( j best observed cases dis ))))*.