Perhaps you should try some spelling variations:
network system » networked systems
dence network » dense network, defence network, dense networks
system report » system reform, system support, system reforms
health dence » health device, health evidence, health science
health guide » health guido, earth guide, health grid

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