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

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 network synthesis report ) OR ( Health 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 network synthesis report ) OR ( Health distance networks synthesis report ))))".
• Adding a wildcard symbol may retrieve word variants: (( health evidence network synthesis report ) or ((( Health distance network synthesis report ) OR ( Health distance networks synthesis report ))))*.