Talvez deva tentar algumas variações de ortografia:
based computer » based composites (Expandir a Pesquisa)
pcr compared » pcr combined (Expandir a Pesquisa)
computer law » computer lab (Expandir a Pesquisa), computer a (Expandir a Pesquisa), computer _ (Expandir a Pesquisa)
caused netw » caused death (Expandir a Pesquisa), caused fetal (Expandir a Pesquisa)
compared a » compared _ (Expandir a Pesquisa)
a eczema » ao eczema (Expandir a Pesquisa), _ eczema (Expandir a Pesquisa), e eczema (Expandir a Pesquisa)
a nortes » a norte (Expandir a Pesquisa), a norreys (Expandir a Pesquisa), a north (Expandir a Pesquisa)
_ based » _ base (Expandir a Pesquisa), _ bases (Expandir a Pesquisa)
law new » jaw new (Expandir a Pesquisa)
c pcr » cd pcr (Expandir a Pesquisa), dc pcr (Expandir a Pesquisa), mc pcr (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j a eczema caused netw ) OR ((( c pcr compared a nortes ) OR ( _ based computer law new ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j a eczema caused netw ) OR ((( c pcr compared a nortes ) OR ( _ based computer law new ))))*.