Perhaps you should try some spelling variations:
"health incidence networks synthesis report" » "health inference networks synthesis report", "health influence networks synthesis report", "health science networks synthesis report", "health incidence nets synthesis report", "death incidence networks synthesis report", "health incident networks synthesis report"
"health incidence networks systems report" » "health inference networks systems report", "health influence networks systems report", "health science networks systems report", "death incidence networks systems report", "health incident networks systems report", "health incidence network systems report", "health incidence networks system report", "health incidence networked systems report", "health incidence networks systems support", "health incidence networks systems recent"
"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"

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