Perhaps you should try some spelling variations:
network synthesis » network systems
distance network » distance networks, resistance network, disease network
health distance » healthy distance, earth distance, health assistance
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 distance network synthesis report )).
• Adding a wildcard symbol may retrieve word variants: (( health dence network synthesis report ) or ( health distance network synthesis report ))*.