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