Perhaps you should try some spelling variations:
network synthesis » network systems
evidence network » incidence networks, resilience network, reference network
guidance network » guide network, finance network, impedance network
science network » sciences network, science networks, science work
health guidance » health evidence, health finance, health substance
health science » health sciences
dence network » dense network, defence network, dense networks

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