Perhaps you should try some spelling variations:
network synthesis » network systems
system supporting » systems supporting, system support
systems report » system report, systems support, systems transport
health device » health service, health services
health dence » health evidence, health science, health devices

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: (("((health dence) or (health device)) network synthesis report") OR ("((health dence) or (health device)) network ((((systems report) or (systems recent))) or (system supporting))")).
• Removing quotes may allow a broader search: (( ((health dence) or (health device)) network synthesis report ) or ( ((health dence) or (health device)) network ((((systems report) or (systems recent))) or (system supporting)) )).
• Adding a wildcard symbol may retrieve word variants: (("((health dence) or (health device)) network synthesis report") or ("((health dence) or (health device)) network ((((systems report) or (systems recent))) or (system supporting))"))*.