Perhaps you should try some spelling variations:
"health evidence network synthesis report" » "health science network synthesis report", "health dence network synthesis report", "health incidence networks synthesis report"
"health guidance network systems recent" » "health guide network systems recent", "health finance network systems recent", "health impedance network systems recent", "health substance network systems recent"
health impedance » health importance, health temperance, health imperative
head impedance » head impedances, load impedance, end impedance

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