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)
levels other » levels another (Expandir a Pesquisa), levels rather (Expandir a Pesquisa), levels over (Expandir a Pesquisa)
doses level » dose level (Expandir a Pesquisa), does level (Expandir a Pesquisa), bones level (Expandir a Pesquisa)
dose levels » noise levels (Expandir a Pesquisa)
drugs does » drugs do (Expandir a Pesquisa), drugs diet (Expandir a Pesquisa)
drug doses » drug disease (Expandir a Pesquisa)
level ther » level theory (Expandir a Pesquisa), level rather (Expandir a Pesquisa), level taper (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: (( drugs does develop them ) or ((( drug doses level ther ) or ( drug dose levels other ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( drugs does develop them ) OR ((( drug doses level ther ) OR ( drug dose levels other ))))*.