Perhaps you should try some spelling variations:
network synthesis » network systems
health science » health sciences
network system » network systems, networked systems
system report » system reform, system support, system reforms
health dence » health device, health devices, health degree

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