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

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