Perhaps you should try some spelling variations:
network synthesis » network systems
systems support » system support, systems supporting, system supporting
systems report » system report, systems recent, systems transport
health device » health service
health dence » health evidence, health science, health 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: "((\"((health dence) OR (((health device) OR (health services)))) network synthesis report\") or (\"((health dence) OR (((health device) OR (health services)))) network ((systems report) OR (systems support))\"))*".
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((\\"((health dence) or (((health device) OR (health services)))) network synthesis report\\") or (\\"((health dence) or (((health device) OR (health services)))) network ((systems report) or (systems support))\\"))*\"".
• Removing quotes may allow a broader search: (( ((health dence) or (((health device) OR (health services)))) network synthesis report ) or ( ((health dence) or (((health device) OR (health services)))) network ((systems report) or (systems support)) ))*.