Perhaps you should try some spelling variations:
"motor neurone disease" » "motor neurons disease", "motor neuronal disease", "motor neutrone disease", "motor neuronse disease", "motor neuroe disease"
"motor neuron disease" » "motor neutron disease", "motor neurons disease", "motor neuro disease"
"motor neuronals disease" » "motor neutronals disease", "motor neuronsals disease", "motor neuroals disease", "motor neuronal disease", "motor neurons 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 neurone disease") or ((("motor neuron disease") or ("motor neuronals disease"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("motor neurone disease") OR ((("motor neuron disease") OR ("motor neuronals disease"))))*.
• Removing quotes may allow a broader search: (( motor neurone disease ) or ((( motor neuron disease ) or ( motor neuronals disease ))))*.