Perhaps you should try some spelling variations:
"neutron model artificial neural network" » "neutron femoral artificial neural network", "neutron real artificial neural network", "neutron model artificial neural networks", "neuron model artificial neural network", "neural model artificial neural network"
"normal model artificial neural network" » "normal femoral artificial neural network", "normal real artificial neural network", "normal model artificial neural networks", "neural model artificial neural network", "novel model artificial neural network"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("neutron model artificial neural network") or ("normal model artificial neural network"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("neutron model artificial neural network") OR ("normal model artificial neural network")).
• Removing quotes may allow a broader search: (( neutron model artificial neural network ) or ( normal model artificial neural network )).
• Adding a wildcard symbol may retrieve word variants: (("neutron model artificial neural network") or ("normal model artificial neural network"))*.