Talvez deva tentar algumas variações de ortografia:
research systems » research synthesis (Expandir a Pesquisa)
crest derived » host derived (Expandir a Pesquisa)
bent research » bench research (Expandir a Pesquisa), event research (Expandir a Pesquisa), agent research (Expandir a Pesquisa)
derived cat » derived cast (Expandir a Pesquisa), derived car (Expandir a Pesquisa), derived ca (Expandir a Pesquisa)
systems dis » systems disk (Expandir a Pesquisa), systems tdis (Expandir a Pesquisa), systems dss (Expandir a Pesquisa)
mehta nave » mehta naveen (Expandir a Pesquisa), mehta navin (Expandir a Pesquisa), mehta nee (Expandir a Pesquisa)
nave cyst » nave costa (Expandir a Pesquisa), nerve cyst (Expandir a Pesquisa), valve cyst (Expandir a Pesquisa)
cyst dis » cyst due (Expandir a Pesquisa)
a crest » _ crest (Expandir a Pesquisa), a creusot (Expandir a Pesquisa), a crespo (Expandir a Pesquisa)
cat dis » cat diets (Expandir a Pesquisa), cat diet (Expandir a Pesquisa)
ai bent » a bent (Expandir a Pesquisa), ai beni (Expandir a Pesquisa), ai best (Expandir a Pesquisa)
k mehta » a mehta (Expandir a Pesquisa), _ mehta (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: (((( a crest derived cat dis ) OR ( ai bent research systems dis ))) OR ( k mehta nave cyst dis ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( a crest derived cat dis ) or ( ai bent research systems dis ))) or ( k mehta nave cyst dis ))*.