Perhaps you should try some spelling variations:
"health evidence network synthesis report" » "health evidence network systems report", "health science network synthesis report", "health guidance network synthesis report", "health dence network synthesis report"
"garch distance network synthesis report" » "garch distance network systems report", "garch distance networks synthesis report", "garch resistance network synthesis report", "garch finance network synthesis report", "search distance network synthesis report", "earth distance network synthesis report", "match distance network synthesis report"
"garch disease network synthesis report" » "garch disease network systems report", "garch dense network synthesis report", "arch disease network synthesis report", "each disease network synthesis report", "arch diseases network synthesis 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 ((("garch distance network synthesis report") OR ("garch disease network synthesis report")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"health evidence network synthesis report\") or (((\"garch distance network synthesis report\") OR (\"garch disease network synthesis report\"))))".
• Removing quotes may allow a broader search: (( health evidence network synthesis report ) or ((( garch distance network synthesis report ) OR ( garch disease network synthesis report )))).
• Adding a wildcard symbol may retrieve word variants: (("health evidence network synthesis report") or ((("garch distance network synthesis report") OR ("garch disease network synthesis report"))))*.