Perhaps you should try some spelling variations:
network synthesis » network systems
health impedance » health importance, health temperance, head impedance
science network » sciences network, science networks, science work
health science » health sciences
dence network » dense network, defence network, dense networks
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 science network synthesis report ) OR ( health dence network synthesis report ))) OR ( health impedance network synthesis report )).
• Adding a wildcard symbol may retrieve word variants: (((( health science network synthesis report ) or ( health dence network synthesis report ))) or ( health impedance network synthesis report ))*.