Perhaps you should try some spelling variations:
networks synthesis » nets synthesis
importance network » important network, impedance network, impededance network
health importance » health insurance
network synthesis » network systems
health incidence » death incidence, health incident, health science
networks systems » network systems, networks system, networked systems

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 importance network synthesis report )).
• Adding a wildcard symbol may retrieve word variants: (( health incidence ((networks synthesis) or (networks systems)) report ) or ( health importance network synthesis report ))*.