Perhaps you should try some spelling variations:
network synthesis » network systems
science networks » sciences network, sequence networks, science works
health impedance » health importance, health temperance, head impedance
science network » sciences network, science work, sequence networks
systems report » systems support, systems recent, systems transport
network system » network systems, networked systems
healthy sense » healthy secure, healthy single, healthy self
system report » system reform, system support, system recent
health dense » health disease, health device, health degree

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