Talvez deva tentar algumas variações de ortografia:
level theory » model theory (Expandir a Pesquisa)
drives liver » driven liver (Expandir a Pesquisa)
doses level » does level (Expandir a Pesquisa), dose levels (Expandir a Pesquisa), bones level (Expandir a Pesquisa)
drug drives » drug driven (Expandir a Pesquisa), drug derived (Expandir a Pesquisa), drugs drive (Expandir a Pesquisa)
level taper » level type (Expandir a Pesquisa), level per (Expandir a Pesquisa), level tuber (Expandir a Pesquisa)
drug doses » drug disease (Expandir a Pesquisa)
liver ther » liver other (Expandir a Pesquisa), live rather (Expandir a Pesquisa), liver thle2 (Expandir a Pesquisa)
dose level » dose levels (Expandir a Pesquisa), noise level (Expandir a Pesquisa), dose live (Expandir a Pesquisa)
drug dose » drug dosage (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 doses level theory ) OR ((( drug drives liver ther ) OR ( drug dose level taper ))))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( drug doses level theory ) or ((( drug drives liver ther ) or ( drug dose level taper ))))*.