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"
"head impedance network synthesis report" » "head impedance network systems report", "head impedances network synthesis report", "load impedance network synthesis report", "end impedance network synthesis report"
health servicess » health service, ehealth services, mhealth services

Try widening your search to All Fields.

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 evidence network synthesis report") OR ("((health services) or (health servicess)) network synthesis report"))) OR ("head impedance network synthesis report")).
• Removing quotes may allow a broader search: (((( health evidence network synthesis report ) or ( ((health services) or (health servicess)) network synthesis report ))) or ( head impedance network synthesis report )).
• Adding a wildcard symbol may retrieve word variants: (((("health evidence network synthesis report") or ("((health services) or (health servicess)) network synthesis report"))) or ("head impedance network synthesis report"))*.