Talvez deva tentar algumas variações de ortografia:
research synthesis » starch synthesis (Expandir a Pesquisa)
mehta research » meta research (Expandir a Pesquisa), beta research (Expandir a Pesquisa), feta research (Expandir a Pesquisa)
center nurse » center nurses (Expandir a Pesquisa), better nurse (Expandir a Pesquisa), letter nurse (Expandir a Pesquisa)
synthesis di » synthesis did (Expandir a Pesquisa), synthesis de (Expandir a Pesquisa), synthesis dna (Expandir a Pesquisa)
cent nerve » bent nerve (Expandir a Pesquisa), recent nerve (Expandir a Pesquisa), crest nerve (Expandir a Pesquisa)
nurse vas » nurse vs (Expandir a Pesquisa), nurse case (Expandir a Pesquisa), nurse a (Expandir a Pesquisa)
2 center » a center (Expandir a Pesquisa)
vas dis » vas dias (Expandir a Pesquisa), vasc dis (Expandir a Pesquisa)
_ mehta » a mehta (Expandir a Pesquisa)
i cent » i cento (Expandir a Pesquisa), ai cent (Expandir a Pesquisa), ii cent (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: (((( 2 center nurse vas dis ) or ( i cent nerve _ dis ))) or ( _ mehta research synthesis di ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( 2 center nurse vas dis ) OR ( i cent nerve _ dis ))) OR ( _ mehta research synthesis di )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( 2 center nurse vas dis ) or ( i cent nerve _ dis ))) or ( _ mehta research synthesis di ))*.