Perhaps you should try some spelling variations:
"health evidence network synthesis report" » "health guidance network synthesis report", "health dence network synthesis report", "health incidence networks synthesis report"
"health impedance network synthesis report" » "health importance network synthesis report", "health temperance network synthesis report", "head impedance network synthesis report"
"health impedance network systems report" » "health importance network systems report", "health temperance network systems report", "head impedance network systems report", "health impedance network system report", "health impedance network systems support", "health impedance network systems recent"
"health science network synthesis report" » "health sciences network synthesis report", "health science networks synthesis report", "health science work synthesis report"

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