Talvez deva tentar algumas variações de ortografia:
computer course » computer courses (Expandir a Pesquisa), computer discourse (Expandir a Pesquisa), computing course (Expandir a Pesquisa)
nat computer » cat computer (Expandir a Pesquisa), fast computer (Expandir a Pesquisa), icat computer (Expandir a Pesquisa)
course new » course news (Expandir a Pesquisa), courses new (Expandir a Pesquisa), course na (Expandir a Pesquisa)
soc netw » hoc netz (Expandir a Pesquisa)
comb soc » comb nov (Expandir a Pesquisa), comb ofc (Expandir a Pesquisa), comb cic (Expandir a Pesquisa)
a comb » a combat (Expandir a Pesquisa)
comb a » comb _ (Expandir a Pesquisa), comb m (Expandir a Pesquisa), comb n (Expandir a Pesquisa)
a neta » a neto (Expandir a Pesquisa), a nectar (Expandir a Pesquisa)
j nat » j nart (Expandir a Pesquisa), _ nat (Expandir a Pesquisa), e nat (Expandir a Pesquisa)
j da » j de (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: (((( j a comb a neta ) or ( ((j da) OR (j d)) comb soc netw ))) or ( j nat computer course new ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j a comb a neta ) OR ( ((j da) OR (j d)) comb soc netw ))) OR ( j nat computer course new ))*.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(((( j a comb a neta ) or ( ((j da) OR (j d)) comb soc netw ))) or ( j nat computer course new ))*".