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