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 neuronale disease" » "motor neuronal disease", "motor neutronale disease", "motor neuroale disease", "motor neuronalale 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((((((("motor neurone disease") OR ("motor neuroe disease"))) or ("motor neuronale disease"))) or ("motor neuron disease"))) or ("motor neurons disease"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((((((("motor neurone disease") OR ("motor neuroe disease"))) OR ("motor neuronale 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 neuronale 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 neuronale 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 neuronale disease"))) or ("motor neuron disease"))) or ("motor neurons disease"))*.