Perhaps you should try some spelling variations:
practice services » practices services, practice service, practices service
nursing practices » nursing practice, farming practices, caring practices
nursing practical » nursing practice, using practical, learning practical
active devices » passive devices, assistive devices

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: "((\"sociology AND nursing ((practice services) OR (active devices))\") or (\"sociology AND ((nursing practices) OR (nursing practical)) service\"))".
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((\\"sociology and nursing ((practice services) or (active devices))\\") or (\\"sociology and ((nursing practices) OR (nursing practical)) service\\"))\"".
• Removing quotes may allow a broader search: (( sociology and nursing ((practice services) or (active devices)) ) or ( sociology and ((nursing practices) OR (nursing practical)) service )).