Talvez deva tentar algumas variações de ortografia:
mental survey » general survey (Expandir a Pesquisa), medical survey (Expandir a Pesquisa), postal survey (Expandir a Pesquisa)
drives system » drives systems (Expandir a Pesquisa), drivers system (Expandir a Pesquisa), drive system (Expandir a Pesquisa)
survey cyst » survey costs (Expandir a Pesquisa), survey cgss (Expandir a Pesquisa), survey casi (Expandir a Pesquisa)
gene drives » gene drive (Expandir a Pesquisa)
mehta nave » mehta naveen (Expandir a Pesquisa), mehta navin (Expandir a Pesquisa), mehta naik (Expandir a Pesquisa)
system due » system der (Expandir a Pesquisa)
nave case » cave case (Expandir a Pesquisa), wave case (Expandir a Pesquisa), native case (Expandir a Pesquisa)
case dis » case disc (Expandir a Pesquisa), case di (Expandir a Pesquisa), case does (Expandir a Pesquisa)
j mental » j mengual (Expandir a Pesquisa), j mena (Expandir a Pesquisa), j mehta (Expandir a Pesquisa)
cyst dis » cyst due (Expandir a Pesquisa), cyst d (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: (( _ mehta nave case dis ) or ((( j mental survey cyst dis ) or ( j gene drives system due ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( _ mehta nave case dis ) OR ((( j mental survey cyst dis ) OR ( j gene drives system due )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( _ mehta nave case dis ) or ((( j mental survey cyst dis ) or ( j gene drives system due ))))*.