Talvez deva tentar algumas variações de ortografia:
threat levers » threat levels (Expandir a Pesquisa), threat level (Expandir a Pesquisa), threat severe (Expandir a Pesquisa)
mental nerve » ventral nerve (Expandir a Pesquisa), central nerve (Expandir a Pesquisa), renal nerve (Expandir a Pesquisa)
nerve cause » nerve caused (Expandir a Pesquisa), nerve case (Expandir a Pesquisa), nerve course (Expandir a Pesquisa)
levers cat » levels can (Expandir a Pesquisa), levers a (Expandir a Pesquisa)
cause does » causes does (Expandir a Pesquisa), cause des (Expandir a Pesquisa), pause does (Expandir a Pesquisa)
bent nerve » absent nerve (Expandir a Pesquisa), dental nerve (Expandir a Pesquisa), benign nerve (Expandir a Pesquisa)
j threat » _ threat (Expandir a Pesquisa), a threat (Expandir a Pesquisa), 2 threat (Expandir a Pesquisa)
j mental » j mengual (Expandir a Pesquisa), j mena (Expandir a Pesquisa), j mehta (Expandir a Pesquisa)
cat dis » cat did (Expandir a Pesquisa), cat diets (Expandir a Pesquisa), cat diet (Expandir a Pesquisa)
nerve a » nerve _ (Expandir a Pesquisa)
l bent » l benth (Expandir a Pesquisa), l bengt (Expandir a Pesquisa), l bento (Expandir a Pesquisa)
a dos » e dos (Expandir a Pesquisa), a dog (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 threat levers cat dis ) or ((( j mental nerve cause does ) or ( l bent nerve a dos ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j threat levers cat dis ) OR ((( j mental nerve cause does ) OR ( l bent nerve a dos )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j threat levers cat dis ) or ((( j mental nerve cause does ) or ( l bent nerve a dos ))))*.