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