Perhaps you should try some spelling variations:
"motor neuronse disease" » "motor neurons disease", "motor neutronse disease", "motor neuronsse disease", "motor neurose disease"
"motor neuronal disease" » "motor neural disease", "motor neutronal disease", "motor neuronsal disease", "motor neuroal disease"
"motor neuron disease" » "motor neutron disease", "motor neurons 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 neuronse disease") OR ("motor neuronal 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 neuronse disease") OR ("motor neuronal 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 neuronse disease\") OR (\"motor neuronal disease\"))) or (((\"motor neuronse disease\") OR (\"motor neuronal disease\"))))) or (\"motor neuron disease\"))".
• Removing quotes may allow a broader search: (((((( motor neuronse disease ) OR ( motor neuronal disease ))) or ((( motor neuronse disease ) OR ( motor neuronal disease ))))) or ( motor neuron disease )).
• Adding a wildcard symbol may retrieve word variants: (((((("motor neuronse disease") OR ("motor neuronal disease"))) or ((("motor neuronse disease") OR ("motor neuronal disease"))))) or ("motor neuron disease"))*.