Perhaps you should try some spelling variations:
networks synthesis » networks systems, nets synthesis
network synthesis » network systems
health incidence » death incidence, health incident, health evidence
health impedance » health importance, health temperance, head impedance
health science » health sciences

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