Talvez deva tentar algumas variações de ortografia:
threat level » threat levels (Expandir a Pesquisa), three level (Expandir a Pesquisa), threat severe (Expandir a Pesquisa)
mental nerve » ventral nerve (Expandir a Pesquisa), central nerve (Expandir a Pesquisa)
nerve caused » nerve case (Expandir a Pesquisa), nerve crush (Expandir a Pesquisa), nerve course (Expandir a Pesquisa)
caused does » cause does (Expandir a Pesquisa), causes does (Expandir a Pesquisa), caused deep (Expandir a Pesquisa)
bent nerve » absent nerve (Expandir a Pesquisa), dental nerve (Expandir a Pesquisa), benign nerve (Expandir a Pesquisa)
level cat » level can (Expandir a Pesquisa), level ca (Expandir a Pesquisa), level catch (Expandir a Pesquisa)
cat diets » fat diets (Expandir a Pesquisa), salt diets (Expandir a Pesquisa), cattle diets (Expandir a Pesquisa)
a threat » _ threat (Expandir a Pesquisa), a three (Expandir a Pesquisa)
j mental » j mengual (Expandir a Pesquisa), j mena (Expandir a Pesquisa), j mehta (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 dis » a dos (Expandir a Pesquisa), a des (Expandir a Pesquisa), a dia (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: (( a threat level cat diets ) or ((( j mental nerve caused does ) or ( l bent nerve a dis ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( a threat level cat diets ) OR ((( j mental nerve caused does ) OR ( l bent nerve a dis )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( a threat level cat diets ) or ((( j mental nerve caused does ) or ( l bent nerve a dis ))))*.