Talvez deva tentar algumas variações de ortografia:
dosages liver » dosage liver (Expandir a Pesquisa), dosages over (Expandir a Pesquisa), dosage given (Expandir a Pesquisa)
drug dosages » drug doses (Expandir a Pesquisa), drug usage (Expandir a Pesquisa), drug dose (Expandir a Pesquisa)
dosage level » dosage levels (Expandir a Pesquisa), usage level (Expandir a Pesquisa), dosage liver (Expandir a Pesquisa)
does novel » does nose (Expandir a Pesquisa), uses novel (Expandir a Pesquisa)
novel ther » novel ether (Expandir a Pesquisa), novel thr (Expandir a Pesquisa), novel theory (Expandir a Pesquisa)
liver ther » liver other (Expandir a Pesquisa), liver rather (Expandir a Pesquisa), live rather (Expandir a Pesquisa)
level race » level rise (Expandir a Pesquisa), level racial (Expandir a Pesquisa)
drug does » drug doses (Expandir a Pesquisa), drugs does (Expandir a Pesquisa), drug dose (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( drug does novel ther ) OR ((( drug dosages liver ther ) OR ( drug dosage level race ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( drug does novel ther ) OR ((( drug dosages liver ther ) OR ( drug dosage level race ))))*.