Perhaps you should try some spelling variations:
chinensis oviduct » chensinensis oviduct
rana chinensis » rana chensinensis, cera chinensis, var chinensis
chinensis ovum » chensinensis ovum, chinenses opium, chinensis lour

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: (( rana chinensis ovum ) OR ( rana chinensis oviduct )).
• Adding a wildcard symbol may retrieve word variants: (( rana chinensis ovum ) or ( rana chinensis oviduct ))*.