Perhaps you should try some spelling variations:
22radiation injuries » rotation injuries
friction injuries » frictions inquiries, friction induces, junction injuries
tnf therapy » vegf therapy
2f therapy » 2 therapy, 21 therapy, 20 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 (friction injuries))) OR (((radiation injury) OR (radiation induced))))) OR (amputation injuries))) OR (radiation injuries)) %((2f therapy) OR (tnf therapy))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((((((22radiation injuries) or (friction injuries))) or (((radiation injury) or (radiation induced))))) or (amputation injuries))) or (radiation injuries)) %((2f therapy) OR (tnf therapy))%22".
• Adding a wildcard symbol may retrieve word variants: %((((((((22radiation injuries) or (friction injuries))) or (((radiation injury) or (radiation induced))))) or (amputation injuries))) or (radiation injuries)) %((2f therapy) OR (tnf therapy))%22*.