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 report" » "health guide network systems report", "health finance network systems report", "health impedance network systems report", "health substance network systems report", "health guidance network system report", "health guidance network systems support", "health guidance 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 report") OR ("((health impedance) OR (head impedance)) network systems report")))).
• Removing quotes may allow a broader search: (( health evidence network synthesis report ) or ((( health guidance network systems report ) or ( ((health impedance) OR (head impedance)) network systems report )))).
• Adding a wildcard symbol may retrieve word variants: (("health evidence network synthesis report") or ((("health guidance network systems report") or ("((health impedance) OR (head impedance)) network systems report"))))*.