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 guided » health guide, health guido, health founded
hath guided » path guided, hath builded, paths guided

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