Perhaps you should try some spelling variations:
networks synthesis » networks systems, nets synthesis
network synthesis » network systems
health incidence » death incidence, path incidence, health insurance
guidance network » guide network, finance network, impedance network
health incident » health including
health guidance » health finance, health substance
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 evidence) OR (health science)) network synthesis report ) OR ( ((health 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) OR (health science)) network synthesis report ) or ( ((health incidence) or (health incident)) networks synthesis report ))) or ( health guidance network synthesis report ))".
• Adding a wildcard symbol may retrieve word variants: (((( ((health evidence) OR (health science)) network synthesis report ) or ( ((health incidence) or (health incident)) networks synthesis report ))) or ( health guidance network synthesis report ))*.