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 neuronal disease" » "motor neutronal disease", "motor neuroal disease", "motor neural disease"
"motor neurons disease" » "motor neutrons disease", "motor neuros disease"
"motor neutrons disease" » "motor neutron disease", "motor neutrinos disease", "motor neutrino 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 neurons disease") or ("motor neutrons 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 neurons disease") OR ("motor neutrons 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 neurons disease\") or (\"motor neutrons disease\"))))))".
• Removing quotes may allow a broader search: (( motor neurone disease ) or ((((( motor neuron disease ) OR ( motor neuronal disease ))) or ((( motor neurons disease ) or ( motor neutrons disease )))))).
• Adding a wildcard symbol may retrieve word variants: (("motor neurone disease") or ((((("motor neuron disease") OR ("motor neuronal disease"))) or ((("motor neurons disease") or ("motor neutrons disease"))))))*.