Talvez deva tentar algumas variações de ortografia:
does develop » boys develop (Expandir a Pesquisa), loss develop (Expandir a Pesquisa), does developing (Expandir a Pesquisa)
develop them » develop type (Expandir a Pesquisa), develop age (Expandir a Pesquisa)
novel theory » model theory (Expandir a Pesquisa), level theory (Expandir a Pesquisa), novel therapy (Expandir a Pesquisa)
drugs does » drugs do (Expandir a Pesquisa)
diet novel » die novel (Expandir a Pesquisa), diet over (Expandir a Pesquisa), yet novel (Expandir a Pesquisa)
dose level » dose levels (Expandir a Pesquisa), noise level (Expandir a Pesquisa), dose live (Expandir a Pesquisa)
level ther » level theory (Expandir a Pesquisa), level rather (Expandir a Pesquisa), levels other (Expandir a Pesquisa)
drug diet » drugs diet (Expandir a Pesquisa), drug de (Expandir a Pesquisa), drug does (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: (((( drugs does develop them ) OR ( drug diet novel theory ))) OR ( drug dose level ther ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( drugs does develop them ) or ( drug diet novel theory ))) or ( drug dose level ther ))*.