Perhaps you should try some spelling variations:
"health substrate network synthesis report" » "health subscribe networks synthesis report", "health subscriber network synthesis report", "health state network synthesis report", "health substance network synthesis report", "earth substrates network synthesis report", "healing substrates network synthesis report"
"health substrate network systems report" » "health subscribe networks systems report", "health subscriber network systems report", "health state network systems report", "health substance network systems report", "earth substrates network systems report", "healing substrates network systems report", "health substrate network system report", "health substrate network systems support", "health substrate network systems recent"
"health guidance network synthesis report" » "health guide network synthesis report", "health finance network synthesis report", "health impedance network synthesis report", "health evidence network synthesis report", "health substance 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 guidance network synthesis report") OR ((("health substrate network synthesis report") OR ("health substrate network systems report")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"health guidance network synthesis report\") or (((\"health substrate network synthesis report\") OR (\"health substrate network systems report\"))))".
• Removing quotes may allow a broader search: (( health guidance network synthesis report ) or ((( health substrate network synthesis report ) OR ( health substrate network systems report )))).
• Adding a wildcard symbol may retrieve word variants: (("health guidance network synthesis report") or ((("health substrate network synthesis report") OR ("health substrate network systems report"))))*.