Perhaps you should try some spelling variations:
networks synthesis » networks systems, nets synthesis
network synthesis » network systems
evidence network » science network, dence network, incidence networks
health incidence » death incidence, health science, path incidence
guidance network » guide network, finance network, guided network
health evidence » health science
health incident » health including

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