Perhaps you should try some spelling variations:
substance network » distance network, substrate network, resistance network
networks systems » networks system, network system, networking systems
guidance network » guide network, finance network, impedance network
health incident » health including
health guidance » health evidence, health finance
systems report » system report, systems support, systems recent
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 incident ((networks systems) OR (networked systems)) report ) OR ( health dence network systems report ))) OR ((( health guidance network synthesis report ) OR ( health substance network synthesis report )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( health incident ((networks systems) OR (networked systems)) report ) or ( health dence network systems report ))) or ((( health guidance network synthesis report ) or ( health substance network synthesis report ))))".
• Adding a wildcard symbol may retrieve word variants: (((( health incident ((networks systems) OR (networked systems)) report ) or ( health dence network systems report ))) or ((( health guidance network synthesis report ) or ( health substance network synthesis report ))))*.