Talvez deva tentar algumas variações de ortografia:
reactive systems » reactive system (Expandir a Pesquisa), reaction systems (Expandir a Pesquisa), reacting systems (Expandir a Pesquisa)
absent reactive » augment reactive (Expandir a Pesquisa), absent native (Expandir a Pesquisa), latent reactive (Expandir a Pesquisa)
center serve » center servers (Expandir a Pesquisa), center service (Expandir a Pesquisa), center survey (Expandir a Pesquisa)
systems dis » systems disk (Expandir a Pesquisa), systems tdis (Expandir a Pesquisa), systems dss (Expandir a Pesquisa)
deal serve » real server (Expandir a Pesquisa), ideal service (Expandir a Pesquisa)
serve cat » nerve cat (Expandir a Pesquisa), serve a (Expandir a Pesquisa), service cats (Expandir a Pesquisa)
j center » j centner (Expandir a Pesquisa), j centeno (Expandir a Pesquisa), j cestero (Expandir a Pesquisa)
j absent » _ absent (Expandir a Pesquisa), l absent (Expandir a Pesquisa), 17 absent (Expandir a Pesquisa)
j deal » j dean (Expandir a Pesquisa), j dell (Expandir a Pesquisa), j deml (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 center serve cat due ) or ((( j deal serve cat due ) or ( j absent reactive systems dis ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j center serve cat due ) OR ((( j deal serve cat due ) OR ( j absent reactive systems dis )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j center serve cat due ) or ((( j deal serve cat due ) or ( j absent reactive systems dis ))))*.