Talvez deva tentar algumas variações de ortografia:
ethics pastern » ethics eastern (Expandir a Pesquisa), ethics pastoral (Expandir a Pesquisa), ethics after (Expandir a Pesquisa)
pastern m.d » stern m.d (Expandir a Pesquisa), pasternak md (Expandir a Pesquisa)
ethics post » ethics lost (Expandir a Pesquisa), ethics cost (Expandir a Pesquisa), ethics lapost (Expandir a Pesquisa)
need ethics » based ethics (Expandir a Pesquisa)
ethics past » ethics case (Expandir a Pesquisa), ethics art (Expandir a Pesquisa), ethics cases (Expandir a Pesquisa)
med ethics » media ethics (Expandir a Pesquisa), meta ethics (Expandir a Pesquisa), meat ethics (Expandir a Pesquisa)
past named » east named (Expandir a Pesquisa), past names (Expandir a Pesquisa), plant named (Expandir a Pesquisa)
post m.d » post m.c (Expandir a Pesquisa), post md (Expandir a Pesquisa), post m.j (Expandir a Pesquisa)
j need » a need (Expandir a Pesquisa), j neep (Expandir a Pesquisa), j neel (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 med ethics pastern m.d ) or ( j med ethics post m.d ))) or ( j need ethics past named ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j med ethics pastern m.d ) OR ( j med ethics post m.d ))) OR ( j need ethics past named )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j med ethics pastern m.d ) or ( j med ethics post m.d ))) or ( j need ethics past named ))*.