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 » health science, path incidence, health insurance
guidance network » guide network, finance network, impedance network
health evidence » health science
death incidence » disease incidence, growth incidence, dengue incidence
health incident » health including
health guidance » health finance, health substance

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 (death incidence))) OR (health incident)) 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 incidence) OR (death incidence))) or (health incident)) networks synthesis report ))) or ( health guidance network synthesis report ))".
• Adding a wildcard symbol may retrieve word variants: (((( health evidence network synthesis report ) or ( ((((health incidence) OR (death incidence))) or (health incident)) networks synthesis report ))) or ( health guidance network synthesis report ))*.