Perhaps you should try some spelling variations:
"motor neuronale disease" » "motor neutronale disease", "motor neuroale disease", "motor neurale 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"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("motor neuronale disease") or ("motor neuron disease"))) or ((("motor neurons disease") OR ("motor neuronal disease"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("motor neuronale disease") OR ("motor neuron disease"))) OR ((("motor neurons disease") OR ("motor neuronal disease")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"motor neuronale disease\") or (\"motor neuron disease\"))) or (((\"motor neurons disease\") OR (\"motor neuronal disease\"))))".
• Removing quotes may allow a broader search: (((( motor neuronale disease ) or ( motor neuron disease ))) or ((( motor neurons disease ) OR ( motor neuronal disease )))).
• Adding a wildcard symbol may retrieve word variants: (((("motor neuronale disease") or ("motor neuron disease"))) or ((("motor neurons disease") OR ("motor neuronal disease"))))*.