Perhaps you should try some spelling variations:
technical activities » technical capabilities, biochemical activities, political activities
physical activities » physical activity
medical activities » critical activities, social activities, neural activities

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: %((((medical activities) OR (physical activities))) OR (technical activities))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((((medical activities) OR (physical activities))) or (technical activities))%22".
• Adding a wildcard symbol may retrieve word variants: %((((medical activities) OR (physical activities))) or (technical activities))%22*.