Perhaps you should try some spelling variations:
central nerve » ventral nerve (Expand Search), central nervous (Expand Search), central neural (Expand Search)
center nerve » cancer nerve (Expand Search), center nurse (Expand Search), letter nerve (Expand Search)
both nerve » both naive (Expand Search), vth nerve (Expand Search), fourth nerve (Expand Search)
ii center » ii centers (Expand Search), iii center (Expand Search), bi center (Expand Search)
nerve cn » nerve can (Expand Search), nerve co (Expand Search), nerve ct (Expand Search)
nerve c » nerve co (Expand Search), nerve ct (Expand Search), nerve _ (Expand Search)
case di » case did (Expand Search), case dti (Expand Search), case de (Expand Search)
j both » j botha (Expand Search), j booth (Expand Search), j bott (Expand Search)
cn due » scan due (Expand Search)
c due » c duke (Expand Search), _ due (Expand Search), 2 due (Expand Search)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((( a central nerve c due ) or ( ii center nerve case di ))) or ( j both nerve cn due ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( a central nerve c due ) OR ( ii center nerve case di ))) OR ( j both nerve cn due )).
• Adding a wildcard symbol may retrieve word variants: (((( a central nerve c due ) or ( ii center nerve case di ))) or ( j both nerve cn due ))*.