Talvez deva tentar algumas variações de ortografia:
mobile computer » mobile computing (Expandir a Pesquisa), mobile complex (Expandir a Pesquisa)
nat clamp » dnan clamp (Expandir a Pesquisa), a clamp (Expandir a Pesquisa), dna clamp (Expandir a Pesquisa)
clamp can » clamp a (Expandir a Pesquisa), clamp ar (Expandir a Pesquisa), clamp cum (Expandir a Pesquisa)
comer can » omer can (Expandir a Pesquisa), comer dan (Expandir a Pesquisa), comes can (Expandir a Pesquisa)
j mobile » _ mobile (Expandir a Pesquisa), a mobile (Expandir a Pesquisa), 1 mobile (Expandir a Pesquisa)
can near » can never (Expandir a Pesquisa), can new (Expandir a Pesquisa)
can now » can non (Expandir a Pesquisa), can new (Expandir a Pesquisa), can ngoc (Expandir a Pesquisa)
l comer » al comer (Expandir a Pesquisa), el comer (Expandir a Pesquisa), all comer (Expandir a Pesquisa)
j nat » j nart (Expandir a Pesquisa), _ nat (Expandir a Pesquisa), e nat (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 mobile computer _ new ) OR ((( j nat clamp can now ) OR ( j l comer can near ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j mobile computer _ new ) OR ((( j nat clamp can now ) OR ( j l comer can near ))))*.