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