Perhaps you should try some spelling variations:
22radiation injuries » friction injuries, rotation injuries
radiation injuries » radiation induced
radiation injury » radiation induced
rf therapy » tnf therapy, grief therapy, vegf therapy
amputation » imputation, computation, reputation

Try widening your search to All Fields.

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