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