Perhaps you should try some spelling variations:
network synthesis » network systems
substance network » distance network, substrate network, resistance network
system supporting » systems supporting, system support
evidence network » science network, guidance network, dence network
health evidence » health science
systems support » system support, systems supporting

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