Talvez deva tentar algumas variações de ortografia:
wards compared » swards compared (Expandir a Pesquisa), ward compared (Expandir a Pesquisa), ards compared (Expandir a Pesquisa)
sarcoma caused » sarcoma case (Expandir a Pesquisa), carcinoma caused (Expandir a Pesquisa), glaucoma caused (Expandir a Pesquisa)
boyd compared » boy compared (Expandir a Pesquisa), boys compared (Expandir a Pesquisa), blood compared (Expandir a Pesquisa)
caused fetal » causes fetal (Expandir a Pesquisa), caused fatal (Expandir a Pesquisa), cause fetal (Expandir a Pesquisa)
compared a » compared _ (Expandir a Pesquisa)
d sarcoma » rd sarcoma (Expandir a Pesquisa), _ sarcoma (Expandir a Pesquisa), a sarcoma (Expandir a Pesquisa)
a nortes » a norte (Expandir a Pesquisa), a norreys (Expandir a Pesquisa), a north (Expandir a Pesquisa)
_ wards » _ ward (Expandir a Pesquisa)
a non » _ non (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 d sarcoma caused fetal ) or ((( j boyd compared a nortes ) or ( _ wards compared a non ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j d sarcoma caused fetal ) OR ((( j boyd compared a nortes ) OR ( _ wards compared a non )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j d sarcoma caused fetal ) or ((( j boyd compared a nortes ) or ( _ wards compared a non ))))*.