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"
health distance » healthy distance, health assistance, health resistance
earth distance » search distance, path distance, earth assistance
garch distance » search distance, match distance, branch distance

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 distance) or (((earth distance) OR (garch distance)))) network synthesis report")).
• Removing quotes may allow a broader search: (( health evidence network synthesis report ) or ( ((health distance) or (((earth distance) OR (garch distance)))) network synthesis report )).
• Adding a wildcard symbol may retrieve word variants: (("health evidence network synthesis report") or ("((health distance) or (((earth distance) OR (garch distance)))) network synthesis report"))*.