Perhaps you should try some spelling variations:
assurance networks » insurance networks, alliance networks, distance networks
network synthesis » network systems
assurance network » insurance networks, assuring network, affordance network
evidence network » science network, guidance network, dence network
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 evidence network synthesis report ) OR ( health ((assurance networks) OR (assurance network)) synthesis report )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( health evidence network synthesis report ) or ( health ((assurance networks) OR (assurance network)) synthesis report ))".
• Adding a wildcard symbol may retrieve word variants: (( health evidence network synthesis report ) or ( health ((assurance networks) OR (assurance network)) synthesis report ))*.