Perhaps you should try some spelling variations:
network synthesis » network systems
evidence network » science network, guidance network, incidence networks
health impedance » health importance, health temperance, head impedance
health devices » health device, health services, health service
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 ((evidence network) OR (dence network)) synthesis report ) OR ( ((health dence) OR (health devices)) network synthesis report ))) OR ( health impedance network synthesis report )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( health ((evidence network) OR (dence network)) synthesis report ) or ( ((health dence) or (health devices)) network synthesis report ))) or ( health impedance network synthesis report ))".
• Adding a wildcard symbol may retrieve word variants: (((( health ((evidence network) OR (dence network)) synthesis report ) or ( ((health dence) or (health devices)) network synthesis report ))) or ( health impedance network synthesis report ))*.