Talvez deva tentar algumas variações de ortografia:
level theory » legal theory (Expandir a Pesquisa), model theory (Expandir a Pesquisa)
drives liver » driven liver (Expandir a Pesquisa)
levels othem » levels other (Expandir a Pesquisa), levels another (Expandir a Pesquisa), levels rather (Expandir a Pesquisa)
doses level » dose level (Expandir a Pesquisa), does level (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)
dose levels » noise levels (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)
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.

• Performing a fuzzy search may retrieve terms with similar spellings: (( drug doses level theory ) or ((( drug drives liver ther ) or ( drug dose levels othem ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( drug doses level theory ) OR ((( drug drives liver ther ) OR ( drug dose levels othem ))))*.