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 finance network systems report", "Health guided network systems report", "Health science network systems report", "Health guidance network systems support", "Health guidance network systems recent", "Health guidance network systems transport", "Health guidance networked systemss report"
"Health guidance network system report" » "Health finance network system report", "Health guided network system report", "Health science network system report", "Health guidance networked systems report", "Health guidance network system reform", "Health guidance network system support", "Health guidance network system recent"
"health impedance network synthesis report" » "health importance network synthesis report", "health temperance network synthesis report", "head impedance network synthesis report"
health guidance » health finance, health substance
"health guide network systems report" » "health guide network systems support", "health guide network systems recent", "health guide network systems transport", "health guide networked systemss report", "health guided network systems report", "health side network systems report", "health wide network systems report", "health guido network systems report", "earth guide network systems report", "health grid network systems report"

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