Perhaps you should try some spelling variations:
"health evidence network synthesis report" » "health evidence network systems report", "health science network synthesis report", "health dence network synthesis report", "health incidence networks synthesis report"
"Health sequence network synthesis report" » "Health sequence network systems report", "Health sequence networks synthesis report", "Health science network synthesis report", "Health sequential network synthesis report"
"health guidance network synthesis report" » "health guidance network systems report", "health guide network synthesis report", "health finance network synthesis report", "health impedance network synthesis report", "health substance network synthesis report"
health sequence » health sequelae, heart sequence, health consequence

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("health evidence network synthesis report") OR ("Health sequence network synthesis report"))) OR ("health guidance network synthesis report")).
• Removing quotes may allow a broader search: (((( health evidence network synthesis report ) or ( Health sequence network synthesis report ))) or ( health guidance network synthesis report )).
• Adding a wildcard symbol may retrieve word variants: (((("health evidence network synthesis report") or ("Health sequence network synthesis report"))) or ("health guidance network synthesis report"))*.