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