Perhaps you should try some spelling variations:
network synthesis » network systems
insurance network » insurance networks, assurance network, assurance networks
disease network » dense network
health disease » heart disease
dence network » dense network, defence network, dense networks
health dence » health device, health evidence, health science

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 network synthesis report ) OR ( health disease network synthesis report ))) OR ( health insurance network synthesis report )).
• Adding a wildcard symbol may retrieve word variants: (((( health dence network synthesis report ) or ( health disease network synthesis report ))) or ( health insurance network synthesis report ))*.