Perhaps you should try some spelling variations:
network synthesis » network systems
systems support » system support, systems supporting, system supporting
health science » health sciences
systems report » system report, systems recent, systems transport
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 ((systems report) OR (systems support)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((health dence) or (health science)) network synthesis report ) or ( ((health dence) or (health science)) network ((systems report) OR (systems support)) ))".
• Adding a wildcard symbol may retrieve word variants: (( ((health dence) or (health science)) network synthesis report ) or ( ((health dence) or (health science)) network ((systems report) OR (systems support)) ))*.