Perhaps you should try some spelling variations:
healthy districts » health districts, health district
network synthesis » network systems
healthy distance » health assistance, health resistance, health substance
earth distance » search distance, path distance, garch distance
dence network » dense network, defence network, dense networks
health dence » health device, health evidence, health science

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 dence network synthesis report ) OR ( ((earth distance) OR (((healthy distance) OR (healthy districts)))) network synthesis report )).
• Adding a wildcard symbol may retrieve word variants: (( health dence network synthesis report ) or ( ((earth distance) or (((healthy distance) or (healthy districts)))) network synthesis report ))*.