Talvez deva tentar algumas variações de ortografia:
disease liver » disease like (Expandir a Pesquisa), disease linked (Expandir a Pesquisa), disease living (Expandir a Pesquisa)
does develop » boys develop (Expandir a Pesquisa), loss develop (Expandir a Pesquisa), does developing (Expandir a Pesquisa)
develop type » developing type (Expandir a Pesquisa)
drug disease » drug release (Expandir a Pesquisa)
level theory » legal theory (Expandir a Pesquisa), model theory (Expandir a Pesquisa), cell theory (Expandir a Pesquisa)
liver ther » liver other (Expandir a Pesquisa), live rather (Expandir a Pesquisa), liver thle2 (Expandir a Pesquisa)
drug does » drug doses (Expandir a Pesquisa), drugs does (Expandir a Pesquisa), drug dose (Expandir a Pesquisa)
non level » ion level (Expandir a Pesquisa), exon level (Expandir a Pesquisa), iron level (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 does develop type ) or ((( drug disease liver ther ) or ( during non level theory ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( drug does develop type ) OR ((( drug disease liver ther ) OR ( during non level theory )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( drug does develop type ) or ((( drug disease liver ther ) or ( during non level theory ))))*.