Talvez deva tentar algumas variações de ortografia:
develop them » develop type (Expandir a Pesquisa), develop age (Expandir a Pesquisa)
deberes ther » deberes de (Expandir a Pesquisa), deberes del (Expandir a Pesquisa), deberes en (Expandir a Pesquisa)
doses novel » dose novel (Expandir a Pesquisa), does novel (Expandir a Pesquisa), uses novel (Expandir a Pesquisa)
novel ether » novel tethered (Expandir a Pesquisa), novelli ethel (Expandir a Pesquisa), novel fathers (Expandir a Pesquisa)
we develop » _ develop (Expandir a Pesquisa), mice develop (Expandir a Pesquisa), help develop (Expandir a Pesquisa)
de deberes » de debates (Expandir a Pesquisa), y deberes (Expandir a Pesquisa), de debentures (Expandir a Pesquisa)
drug doses » drug dose (Expandir a Pesquisa), drug disease (Expandir a Pesquisa)
drug we » drug web (Expandir a Pesquisa), drug wf (Expandir a Pesquisa), drug wy (Expandir a Pesquisa)
drug de » drug dose (Expandir a Pesquisa), drug dna (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: (((( drug we develop them ) OR ( drug de deberes ther ))) OR ( drug doses novel ether ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( drug we develop them ) or ( drug de deberes ther ))) or ( drug doses novel ether ))*.