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