Perhaps you should try some spelling variations:
networks synthesis » nets synthesis
network synthesis » network systems
health incidence » death incidence, health incident, health science
networks systems » network systems, networks system, networked systems
guidance network » guide network, finance network, impedance network
health guidance » health evidence, 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 incidence ((networks synthesis) OR (networks systems)) report ) OR ( health guidance network synthesis report )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( health incidence ((networks synthesis) OR (networks systems)) report ) or ( health guidance network synthesis report ))".
• Adding a wildcard symbol may retrieve word variants: (( health incidence ((networks synthesis) OR (networks systems)) report ) or ( health guidance network synthesis report ))*.