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