Perhaps you should try some spelling variations:
health impedance » health importance, health temperance, head impedance
science network » sciences network, science networks, science work
health science » health sciences
systems report » systems support, systems recent, systems transport
system report » system reform, system support
system recent » systems recent
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 systems report ) OR ( health dense network ((system report) OR (system recent)) ))) OR ( health impedance network synthesis report )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( health science network systems report ) or ( health dense network ((system report) OR (system recent)) ))) or ( health impedance network synthesis report ))".
• Adding a wildcard symbol may retrieve word variants: (((( health science network systems report ) or ( health dense network ((system report) OR (system recent)) ))) or ( health impedance network synthesis report ))*.