Perhaps you should try some spelling variations:
healthy districts » health districts
"health science network synthesis report" » "health science network systems report", "health sciences network synthesis report", "health science networks synthesis report", "health science work synthesis report"
healthy distance » health assistance, health resistance, health substance
earth distance » search distance, path distance, garch distance

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("health science network synthesis report") OR ("((earth distance) or (((healthy distance) or (((healthy districts) or (health district)))))) network synthesis report")).
• Removing quotes may allow a broader search: (( health science network synthesis report ) or ( ((earth distance) or (((healthy distance) or (((healthy districts) or (health district)))))) network synthesis report )).
• Adding a wildcard symbol may retrieve word variants: (("health science network synthesis report") or ("((earth distance) or (((healthy distance) or (((healthy districts) or (health district)))))) network synthesis report"))*.