Talvez deva tentar algumas variações de ortografia:
helicene derived » helices derived (Expandir a Pesquisa), ferrocene derived (Expandir a Pesquisa), line derived (Expandir a Pesquisa)
preeti cash » preeti rajesh (Expandir a Pesquisa), preeti doshi (Expandir a Pesquisa), preeti latha (Expandir a Pesquisa)
belt drive » belt drives (Expandir a Pesquisa), test drive (Expandir a Pesquisa)
system dis » system dias (Expandir a Pesquisa), system dcs (Expandir a Pesquisa), system di (Expandir a Pesquisa)
_ helicene » 5 helicene (Expandir a Pesquisa), _ helicase (Expandir a Pesquisa), _ helices (Expandir a Pesquisa)
cash dis » cash lisa (Expandir a Pesquisa), cash desk (Expandir a Pesquisa), cash d (Expandir a Pesquisa)
mast dis » mast id (Expandir a Pesquisa), mast d (Expandir a Pesquisa)
_ mehta » a mehta (Expandir a Pesquisa)
i belt » ji belt (Expandir a Pesquisa), i bell (Expandir a Pesquisa), i belo (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: (( i belt drive system dis ) or ((( _ mehta preeti cash dis ) or ( _ helicene derived mast dis ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( i belt drive system dis ) OR ((( _ mehta preeti cash dis ) OR ( _ helicene derived mast dis )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( i belt drive system dis ) or ((( _ mehta preeti cash dis ) or ( _ helicene derived mast dis ))))*.