Talvez deva tentar algumas variações de ortografia:
power systems » power system (Expandir a Pesquisa)
mailed blood » mixed blood (Expandir a Pesquisa), walled blood (Expandir a Pesquisa), called blood (Expandir a Pesquisa)
lange viola » lanier viola (Expandir a Pesquisa), lange nikola (Expandir a Pesquisa), anne viola (Expandir a Pesquisa)
systems w » systems we (Expandir a Pesquisa), systems _ (Expandir a Pesquisa), systems a (Expandir a Pesquisa)
blood res » blood pres (Expandir a Pesquisa), blood red (Expandir a Pesquisa), blood re (Expandir a Pesquisa)
j mather » j mathew (Expandir a Pesquisa), j matthew (Expandir a Pesquisa), j mathews (Expandir a Pesquisa)
a mailed » a failed (Expandir a Pesquisa), _ mailed (Expandir a Pesquisa), a maize (Expandir a Pesquisa)
6 power » 26 power (Expandir a Pesquisa), _ power (Expandir a Pesquisa), a power (Expandir a Pesquisa)
viola a » viola _ (Expandir a Pesquisa), viola b (Expandir a Pesquisa)
j maher » m maher (Expandir a Pesquisa), a maher (Expandir a Pesquisa), g maher (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( 6 power systems w lange viola a ) OR ( ((j mather) OR (j maher)) m a mailed blood res ))~.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( 6 power systems w lange viola a ) or ( ((j mather) OR (j maher)) m a mailed blood res ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( 6 power systems w lange viola a ) or ( ((j mather) OR (j maher)) m a mailed blood res ))*.