Perhaps you should try some spelling variations:
"normal femoral artificial neural network" » "normal real artificial neural network", "normal femoral artificial neural networks", "proximal femoral artificial neural network"
"neuron model artificial neural network" » "neuron real artificial neural network", "neuron model artificial neural networks", "neural model artificial neural network", "nerf 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: (("neuron model artificial neural network") or ("normal femoral artificial neural network"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("neuron model artificial neural network") OR ("normal femoral artificial neural network")).
• Removing quotes may allow a broader search: (( neuron model artificial neural network ) or ( normal femoral artificial neural network )).
• Adding a wildcard symbol may retrieve word variants: (("neuron model artificial neural network") or ("normal femoral artificial neural network"))*.