Perhaps you should try some spelling variations:
healthy districts » health districts, healthy metrics
network synthesis » network systems
evidence network » science network, guidance network, dence network
healthy distance » health assistance, health resistance, healthy dietary
health evidence » health science
earth distance » search distance, path distance, garch distance

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 ( ((earth distance) OR (((((healthy distance) OR (health substance))) OR (((healthy districts) OR (health district)))))) network synthesis report )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( health evidence network synthesis report ) or ( ((earth distance) or (((((healthy distance) OR (health substance))) or (((healthy districts) or (health district)))))) network synthesis report ))".
• Adding a wildcard symbol may retrieve word variants: (( health evidence network synthesis report ) or ( ((earth distance) or (((((healthy distance) OR (health substance))) or (((healthy districts) or (health district)))))) network synthesis report ))*.