Perhaps you should try some spelling variations:
network synthesis » network systems
insurance network » insurance networks, assurance network, assurance networks
dence network » defence network, dense networks, device network
dense network » dense networks
system report » system reform, system support, system reforms
guide network » guided network, side network, wide network
health guide » health guido, earth guide, health grid

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) OR (dense network)) system report ) OR ((( health guide network synthesis report ) OR ( health insurance network synthesis report )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( health ((dence network) OR (dense network)) system report ) or ((( health guide network synthesis report ) or ( health insurance network synthesis report ))))".
• Adding a wildcard symbol may retrieve word variants: (( health ((dence network) OR (dense network)) system report ) or ((( health guide network synthesis report ) or ( health insurance network synthesis report ))))*.