Talvez deva tentar algumas variações de ortografia:
diet develop » diet developed (Expandir a Pesquisa), diets developed (Expandir a Pesquisa), diet developing (Expandir a Pesquisa)
develop them » develop type (Expandir a Pesquisa), develop age (Expandir a Pesquisa)
dose levels » noise levels (Expandir a Pesquisa)
levels ther » levels other (Expandir a Pesquisa), levels rather (Expandir a Pesquisa), levels three (Expandir a Pesquisa)
bone level » gene level (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 bone » drugs bone (Expandir a Pesquisa), drug alone (Expandir a Pesquisa), drug bound (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 diet develop them ) or ((( drug bone level ther ) or ( drug dose levels ther ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( drug diet develop them ) OR ((( drug bone level ther ) OR ( drug dose levels ther )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( drug diet develop them ) or ((( drug bone level ther ) or ( drug dose levels ther ))))*.