Perhaps you should try some spelling variations:
networks synthesis » networks systems, nets synthesis
network synthesis » network systems
evidence network » science network, incidence networks, resilience network
health incidence » death incidence, health incident, path incidence
guidance network » guide network, finance network, impedance network
health guidance » health finance, health substance
health science » health sciences
dence network » dense network, defence network, dense networks
health dence » health device, health devices, health degree

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