Perhaps you should try some spelling variations:
22radiation injuries » radiation injury, friction injuries, rotation injuries
radiation injuries » radiation injury, radiation induced
rf therapy » tnf therapy, brief therapy, grief therapy
2 therapy » 2 therapie
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 (amputation injuries))) OR (radiation injuries)) %((rf therapy) OR (2 therapy))%22.
• Adding a wildcard symbol may retrieve word variants: %((((22radiation injuries) or (amputation injuries))) or (radiation injuries)) %((rf therapy) or (2 therapy))%22*.