Talvez deva tentar algumas variações de ortografia:
dose levels » noise levels (Expandir a Pesquisa)
liver other » liver another (Expandir a Pesquisa), over other (Expandir a Pesquisa), liver over (Expandir a Pesquisa)
levels ther » levels other (Expandir a Pesquisa), levels rather (Expandir a Pesquisa), levels three (Expandir a Pesquisa)
drugs does » drugs do (Expandir a Pesquisa)
does liver » does life (Expandir a Pesquisa), does laser (Expandir a Pesquisa), drives liver (Expandir a Pesquisa)
drug diet » drugs diet (Expandir a Pesquisa), drug de (Expandir a Pesquisa), drug does (Expandir a Pesquisa)
diet deep » die deep (Expandir a Pesquisa), duet deep (Expandir a Pesquisa), diet sleep (Expandir a Pesquisa)
drug dose » drug dosage (Expandir a Pesquisa)
deep tcr » deep tech (Expandir a Pesquisa), deep tier (Expandir a Pesquisa), deep tls (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: (( drug diet deep tcr ) OR ((( drugs does liver other ) OR ( drug dose levels ther ))))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( drug diet deep tcr ) or ((( drugs does liver other ) or ( drug dose levels ther ))))*.