Talvez deva tentar algumas variações de ortografia:
level theory » legal theory (Expandir a Pesquisa), model theory (Expandir a Pesquisa), cell theory (Expandir a Pesquisa)
develop them » develop type (Expandir a Pesquisa), develop age (Expandir a Pesquisa)
doses level » dose level (Expandir a Pesquisa), does level (Expandir a Pesquisa), dose levels (Expandir a Pesquisa)
bse develop » we develop (Expandir a Pesquisa), age develop (Expandir a Pesquisa), e develop (Expandir a Pesquisa)
drug doses » drug dose (Expandir a Pesquisa), drug disease (Expandir a Pesquisa)
devel ther » novel ther (Expandir a Pesquisa)
de devel » de deve (Expandir a Pesquisa), de dever (Expandir a Pesquisa), de deber (Expandir a Pesquisa)
drug bse » drug abuse (Expandir a Pesquisa), drug based (Expandir a Pesquisa), drug able (Expandir a Pesquisa)
drug de » drug dna (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 doses level theory ) or ( drug de devel ther ))) or ( drug bse develop them ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( drug doses level theory ) OR ( drug de devel ther ))) OR ( drug bse develop them ))*.