Talvez deva tentar algumas variações de ortografia:
tempo derived » tem derived (Expandir a Pesquisa), efemp1 derived (Expandir a Pesquisa), stereo derived (Expandir a Pesquisa)
both negative » both native (Expandir a Pesquisa), ph negative (Expandir a Pesquisa), high negative (Expandir a Pesquisa)
negative cat » negative cats (Expandir a Pesquisa), negative case (Expandir a Pesquisa), negative caix (Expandir a Pesquisa)
nerve system » nervous system (Expandir a Pesquisa), drive system (Expandir a Pesquisa)
derived cd4 » derived cd34 (Expandir a Pesquisa), derived c (Expandir a Pesquisa), derived cell (Expandir a Pesquisa)
system dan » system data (Expandir a Pesquisa), system dias (Expandir a Pesquisa), system der (Expandir a Pesquisa)
cd4 dias » cd4 dim (Expandir a Pesquisa), cd4 ciks (Expandir a Pesquisa), cd4 da (Expandir a Pesquisa)
cat diet » cat diets (Expandir a Pesquisa), fat diet (Expandir a Pesquisa), eat diet (Expandir a Pesquisa)
j beta » j beth (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: (((( a tempo derived cd4 dias ) or ( i both negative cat diet ))) or ( j beta nerve system dan ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( a tempo derived cd4 dias ) OR ( i both negative cat diet ))) OR ( j beta nerve system dan ))*.