Perhaps you should try some spelling variations:
"motor neurone disease" » "motor neuronal disease", "motor neutrone disease", "motor neuroe disease", "motor neuronale disease"
"motor neuroe disease" » "motor neuro disease"
"motor neuron disease" » "motor neutron disease", "motor neuro disease", "motor neuronal disease"
"motor neurons disease" » "motor neutrons disease", "motor neuros disease", "motor neuronals disease", "motor neuronal disease"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("motor neurone disease") OR ("motor neuroe disease"))) OR ("motor neuron disease"))) OR ("motor neurons disease"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"motor neurone disease\") OR (\"motor neuroe disease\"))) or (\"motor neuron disease\"))) or (\"motor neurons disease\"))~".
• Removing quotes may allow a broader search: (((((( motor neurone disease ) OR ( motor neuroe disease ))) or ( motor neuron disease ))) or ( motor neurons disease ))~.
• Adding a wildcard symbol may retrieve word variants: (((((("motor neurone disease") OR ("motor neuroe disease"))) or ("motor neuron disease"))) or ("motor neurons disease"))*.