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

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("neural model artificial neural networks") OR ("neural real artificial neural networks"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"neural model artificial neural networks\") OR (\"neural real artificial neural networks\"))".
• Removing quotes may allow a broader search: (( neural model artificial neural networks ) OR ( neural real artificial neural networks )).
• Adding a wildcard symbol may retrieve word variants: (("neural model artificial neural networks") OR ("neural real artificial neural networks"))*.