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