Talvez deva tentar algumas variações de ortografia:
costs compared » counts compared (Expandir a Pesquisa), tests compared (Expandir a Pesquisa), costs comparing (Expandir a Pesquisa)
compared boron » coated boron (Expandir a Pesquisa), compared blood (Expandir a Pesquisa)
computer case » computer based (Expandir a Pesquisa), computer code (Expandir a Pesquisa), computer crime (Expandir a Pesquisa)
nat computer » cat computer (Expandir a Pesquisa), fast computer (Expandir a Pesquisa), icat computer (Expandir a Pesquisa)
computer can » computers can (Expandir a Pesquisa), computer a (Expandir a Pesquisa), computer code (Expandir a Pesquisa)
case now » cases now (Expandir a Pesquisa), case non (Expandir a Pesquisa), case new (Expandir a Pesquisa)
c costs » c costa (Expandir a Pesquisa), c cost (Expandir a Pesquisa), c costi (Expandir a Pesquisa)
_ nat » _ net (Expandir a Pesquisa), _ nad (Expandir a Pesquisa), _ nab (Expandir a Pesquisa)
ngoc » ngo (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: (( c costs compared boron ngoc ) or ((( _ nat computer can new ) or ( _ nat computer case now ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( c costs compared boron ngoc ) OR ((( _ nat computer can new ) OR ( _ nat computer case now )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( c costs compared boron ngoc ) or ((( _ nat computer can new ) or ( _ nat computer case now ))))*.