Perhaps you should try some spelling variations:
knight's cross » knight's case, knight's ghost, knight's risk
knights across » rights across
neuron co » neuron _, neuron 4
neuron a » neuron _
_ leaves » _ leave

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((knight's cross) OR (knights across)) of the ((neuron co) OR (neuron a)) with _ leaves.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((knight's cross) or (knights across)) of the ((neuron co) OR (neuron a)) with _ leaves".
• Adding a wildcard symbol may retrieve word variants: ((knight's cross) or (knights across)) of the ((neuron co) OR (neuron a)) with _ leaves*.