Talvez deva tentar algumas variações de ortografia:
research synthesis » starch synthesis (Expandir a Pesquisa)
mental research » dental research (Expandir a Pesquisa), central research (Expandir a Pesquisa), neonatal research (Expandir a Pesquisa)
letter nerve » letter nurse (Expandir a Pesquisa), matter nerve (Expandir a Pesquisa), letter nervous (Expandir a Pesquisa)
synthesis di » synthesis did (Expandir a Pesquisa), synthesis de (Expandir a Pesquisa), synthesis dna (Expandir a Pesquisa)
cento nerve » bent nerve (Expandir a Pesquisa), central nerve (Expandir a Pesquisa), mental nerve (Expandir a Pesquisa)
nerve vii » nerve vi (Expandir a Pesquisa)
j letter » bj letter (Expandir a Pesquisa), cj letter (Expandir a Pesquisa), j letters (Expandir a Pesquisa)
j mental » j mengual (Expandir a Pesquisa), j mena (Expandir a Pesquisa), j mehta (Expandir a Pesquisa)
vii dis » vii di (Expandir a Pesquisa), vii denis (Expandir a Pesquisa), vii dogs (Expandir a Pesquisa)
i cento » a cento (Expandir a Pesquisa), i censo (Expandir a Pesquisa), i centeno (Expandir a Pesquisa)
nerve c » nerve cn (Expandir a Pesquisa), nerve _ (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
c dias » c diaz (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 letter nerve vii dis ) or ( i cento nerve c dias ))) or ( j mental research synthesis di ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j letter nerve vii dis ) OR ( i cento nerve c dias ))) OR ( j mental research synthesis di )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j letter nerve vii dis ) or ( i cento nerve c dias ))) or ( j mental research synthesis di ))*.