Perhaps you should try some spelling variations:
benigno leyva » benigno pena (Expand Search)
ventral nerve » femoral nerve (Expand Search)
crespo nerve » crest nerve (Expand Search), crespo hervas (Expand Search), crespo servan (Expand Search)
leyva cyst » leyva cyntia (Expand Search)
nerve cat » nerve ct (Expand Search), nerve cut (Expand Search), nerve case (Expand Search)
a ventral » _ ventral (Expand Search), a ventura (Expand Search)
nerve can » nerve canal (Expand Search), nerve case (Expand Search), nerve a (Expand Search)
j benigno » a benigno (Expand Search), c benigno (Expand Search), _ benigno (Expand Search)
j crespo » g crespo (Expand Search), a crespo (Expand Search), _ crespo (Expand Search)
can dcs » can tdcs (Expand Search), can dce (Expand Search), can bddcs (Expand Search)
cyst e » cyst _ (Expand Search), cyst a (Expand Search)
cat e » catt e (Expand Search), ccat e (Expand Search), cat _ (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.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((( j crespo nerve cat e ) OR ( a ventral nerve can dcs ))) OR ( j benigno leyva cyst e ))~.
• Adding a wildcard symbol may retrieve word variants: (((( j crespo nerve cat e ) or ( a ventral nerve can dcs ))) or ( j benigno leyva cyst e ))*.