Perhaps you should try some spelling variations:
networks synthesis » networks systems, nets synthesis
network synthesis » network systems
evidence network » science network, guidance network, dence network
healthy distance » health assistance, health resistance, healthy districts
health evidence » health science
health distance » earth distance, health assistance, health resistance

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