Perhaps you should try some spelling variations:
22radiation injuries » radiation injuries, radiation injury, rotation injuries
friction injuries » frictions inquiries, friction induces, junction injuries
21 therapy » 11 therapy, 21 therapie

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)) %((21 therapy) OR (1 therapy))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22radiation injuries) OR (friction injuries)) %((21 therapy) or (1 therapy))%22".
• Adding a wildcard symbol may retrieve word variants: %((22radiation injuries) OR (friction injuries)) %((21 therapy) or (1 therapy))%22*.