Perhaps you should try some spelling variations:
"health evidence network synthesis report" » "health science network synthesis report", "health guidance network synthesis report", "health dence network synthesis report"
"health impedance network systems report" » "health importance network systems report", "health temperance network systems report", "health imperative network systems report", "health impedance network system report", "health impedance network systems support", "health impedance network systems recent"
health science » health sciences
health devices » health device, health services, health service
"head impedance network systems report" » "head impedance network system report", "head impedance network systems support", "head impedance network systems recent", "head impedances network systems report", "load impedance network systems report", "end impedance network systems report"

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