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

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