Perhaps you should try some spelling variations:
networks synthesis » networks systems, nets synthesis
network synthesis » network systems
evidence network » science network, guidance network, incidence networks
health incidence » death incidence, health science, health evidence
health incident » health including
dence network » dense network, defence network, dense networks
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 ((evidence network) OR (dence network)) synthesis report ) OR ( ((health incidence) OR (health incident)) networks synthesis report ))) OR ( health guide 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 incidence) or (health incident)) networks synthesis report ))) or ( health guide network synthesis report ))".
• Adding a wildcard symbol may retrieve word variants: (((( health ((evidence network) OR (dence network)) synthesis report ) or ( ((health incidence) or (health incident)) networks synthesis report ))) or ( health guide network synthesis report ))*.