Talvez deva tentar algumas variações de ortografia:
direct observed » directly observed (Expandir a Pesquisa), defect observed (Expandir a Pesquisa), defects observed (Expandir a Pesquisa)
observed crista » observed risk (Expandir a Pesquisa), observed cost (Expandir a Pesquisa), observed aridity (Expandir a Pesquisa)
serves cystic » series cystic (Expandir a Pesquisa), serous cystic (Expandir a Pesquisa), nerve cystic (Expandir a Pesquisa)
genes serves » gene serves (Expandir a Pesquisa), genes series (Expandir a Pesquisa), genes serve (Expandir a Pesquisa)
cystic ducts » cystic duct (Expandir a Pesquisa), cystic ductal (Expandir a Pesquisa)
crista dis » crista dos (Expandir a Pesquisa), crista de (Expandir a Pesquisa), crista da (Expandir a Pesquisa)
vdj genes » vdj gene (Expandir a Pesquisa), j genes (Expandir a Pesquisa)
1 direct » 1 directs (Expandir a Pesquisa), 1 directly (Expandir a Pesquisa), 1 directed (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: (( 1 direct observed crista dis ) or ( vdj genes serves cystic ducts ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( 1 direct observed crista dis ) OR ( vdj genes serves cystic ducts ))*.