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 recent
health dence » health device, health evidence, 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 science)) network synthesis report ) OR ( ((health dence) OR (health science)) network system report )).
• Adding a wildcard symbol may retrieve word variants: (( ((health dence) or (health science)) network synthesis report ) or ( ((health dence) or (health science)) network system report ))*.