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 neutronal disease" » "motor neuronal disease", "motor neutral disease", "motor neutron 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 neurone disease") or ((("motor neutronal disease") or ("motor neutronal disease"))))) or ("motor neuron disease"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("motor neurone disease") OR ((("motor neutronal disease") OR ("motor neutronal disease"))))) OR ("motor neuron disease")).
• Removing quotes may allow a broader search: (((( motor neurone disease ) or ((( motor neutronal disease ) or ( motor neutronal disease ))))) or ( motor neuron disease )).
• Adding a wildcard symbol may retrieve word variants: (((("motor neurone disease") or ((("motor neutronal disease") or ("motor neutronal disease"))))) or ("motor neuron disease"))*.