Perhaps you should try some spelling variations:
22radiation injuries » radiation injury, friction injuries, rotation injuries
radiation injuries » radiation injury, radiation induced
2f therapy » 2 therapy, 21 therapy, 20 therapy

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• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22radiation injuries) OR (radiation injuries)) %2f therapy%22".
• Adding a wildcard symbol may retrieve word variants: %((22radiation injuries) OR (radiation injuries)) %2f therapy%22*.