Perhaps you should try some spelling variations:
network synthesis » network systems
systems support » system support, systems supporting, system supporting
health device » health service, health services
system report » system reform, system support, system recent
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)) network synthesis report") OR ("((health dence) or (health device)) network ((system report) or (systems support))")).
• Removing quotes may allow a broader search: (( ((health dence) or (health device)) network synthesis report ) or ( ((health dence) or (health device)) network ((system report) or (systems support)) )).
• Adding a wildcard symbol may retrieve word variants: (("((health dence) or (health device)) network synthesis report") or ("((health dence) or (health device)) network ((system report) or (systems support))"))*.