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 support" » "health importance network systems support", "health temperance network systems support", "health imperative network systems support", "health impedance network system support", "health impedance network systems supporting", "health impedance network system supporting"
"head impedance network systems support" » "head impedance network system support", "head impedance network systems supporting", "head impedance network system supporting", "head impedances network systems support", "load impedance network systems support", "end impedance network systems support"
health devices » health device, health services, health service
health dence » health device, health science, health degree

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