Perhaps you should try some spelling variations:
"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 impedance » health importance, health temperance, head impedance

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 impedance network synthesis report")).
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