Talvez deva tentar algumas variações de ortografia:
currently surveys » current surveys (Expandir a Pesquisa), current survey (Expandir a Pesquisa)
detect natural » detect neural (Expandir a Pesquisa), detecting natural (Expandir a Pesquisa), affect natural (Expandir a Pesquisa)
natural cause » natural causes (Expandir a Pesquisa), nature cause (Expandir a Pesquisa), natural mouse (Expandir a Pesquisa)
j currently » _ currently (Expandir a Pesquisa), a currently (Expandir a Pesquisa), i currently (Expandir a Pesquisa)
surveys les » surveys does (Expandir a Pesquisa), surveys lead (Expandir a Pesquisa), surveys de (Expandir a Pesquisa)
we detect » _ detect (Expandir a Pesquisa)
cause des » cause de (Expandir a Pesquisa), cause dna (Expandir a Pesquisa)
les due » lines due (Expandir a Pesquisa), alces due (Expandir a Pesquisa), holes due (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 currently surveys les due ) or ( we detect natural cause des ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j currently surveys les due ) OR ( we detect natural cause des )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j currently surveys les due ) or ( we detect natural cause des ))*.