Perhaps you should try some spelling variations:
networks synthesis » networks systems, nets synthesis
"health evidence network synthesis report" » "health evidence network systems report", "health science network synthesis report", "health guidance network synthesis report", "health dence network synthesis report"
"health impedance network synthesis report" » "health impedance network systems report", "health importance network synthesis report", "health temperance network synthesis report", "head impedance network synthesis report"
health incident » health including
health sciences » earth 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 network synthesis report") OR ("((health incident) or (((health science) or (health sciences)))) networks synthesis report"))) OR ("health impedance network synthesis report")).
• Removing quotes may allow a broader search: (((( health evidence network synthesis report ) or ( ((health incident) or (((health science) or (health sciences)))) networks synthesis report ))) or ( health impedance network synthesis report )).
• Adding a wildcard symbol may retrieve word variants: (((("health evidence network synthesis report") or ("((health incident) or (((health science) or (health sciences)))) networks synthesis report"))) or ("health impedance network synthesis report"))*.