Talvez debería tentar con algunhas variantes ortográficas:
computer added » computer aided (Expandir procura), computer coded (Expandir procura), computer add (Expandir procura)
under computer » under computed (Expandir procura), user computer (Expandir procura), modern computer (Expandir procura)
nat clamp » dnan clamp (Expandir procura), dna clamp (Expandir procura), aaa clamp (Expandir procura)
clamp can » clamp a (Expandir procura), clamp ar (Expandir procura), clamp cum (Expandir procura)
clamp pcr » lamp pcr (Expandir procura), clamp pcna (Expandir procura), amp pcr (Expandir procura)
pcr newts » pcr next (Expandir procura), pcr new (Expandir procura)
added now » added co (Expandir procura), added n (Expandir procura), added na1 (Expandir procura)
can near » can never (Expandir procura), can new (Expandir procura)
a clamp » _ clamp (Expandir procura), a claims (Expandir procura)
j under » tj under (Expandir procura), j unger (Expandir procura), j undem (Expandir procura)
j nat » j nart (Expandir procura), _ nat (Expandir procura), a nat (Expandir procura)

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: (((( j nat clamp can near ) or ( j a clamp pcr newts ))) or ( j under computer added now ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j nat clamp can near ) OR ( j a clamp pcr newts ))) OR ( j under computer added now )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j nat clamp can near ) or ( j a clamp pcr newts ))) or ( j under computer added now ))*.