Perhaps you should try some spelling variations:
"motor neurone disease" » "motor neurons disease", "motor neutrone disease", "motor neuronse disease", "motor neuroe disease"
"motor neuronal disease" » "motor neural disease", "motor neutronal disease", "motor neuronsal disease", "motor neuroal disease"
"motor neuroal disease" » "motor neural 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 neuronal disease") OR ("motor neuroal disease"))))) or ("motor neuron disease"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("motor neurone disease") OR ((("motor neuronal disease") OR ("motor neuroal disease"))))) OR ("motor neuron disease"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"motor neurone disease\") or (((\"motor neuronal disease\") OR (\"motor neuroal disease\"))))) or (\"motor neuron disease\"))*".
• Removing quotes may allow a broader search: (((( motor neurone disease ) or ((( motor neuronal disease ) OR ( motor neuroal disease ))))) or ( motor neuron disease ))*.