Perhaps you should try some spelling variations:
"motor neuronal disease" » "motor neural disease", "motor neutronal disease", "motor neuronsal disease", "motor neuroal disease"
"motor neutrone disease" » "motor neutron disease", "motor neutrino disease", "motor neurons disease"
"motor neuronse disease" » "motor neurons disease", "motor neutronse disease", "motor neuronsse disease", "motor neurose disease"
"motor neuron disease" » "motor neutron disease", "motor neurons disease", "motor neuro disease"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((((("motor neuronal disease") or ("motor neutrone disease"))) or ("motor neuronse disease"))) or ("motor neuron disease"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("motor neuronal disease") OR ("motor neutrone disease"))) OR ("motor neuronse disease"))) OR ("motor neuron disease")).
• Removing quotes may allow a broader search: (((((( motor neuronal disease ) or ( motor neutrone disease ))) or ( motor neuronse disease ))) or ( motor neuron disease )).
• Adding a wildcard symbol may retrieve word variants: (((((("motor neuronal disease") or ("motor neutrone disease"))) or ("motor neuronse disease"))) or ("motor neuron disease"))*.