Perhaps you should try some spelling variations:
network synthesis » network systems
science network » sciences network, science networks, sequence networks
systems report » systems support, systems recent, systems transport
network system » network systems, networked systems
head impedance » head impedances, load impedance, end impedance
system report » system reform, system support, system recent
science work » science works, science world, science where
health dense » healthy sense, health disease, health device

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