Perhaps you should try some spelling variations:
evidence network » science network, guidance network, incidence networks
health evidence » health science
systems report » system report, systems support, systems recent
dence network » dense network, defence network, dense networks
health dence » health device, health science, health devices

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 synthesis report ) OR ( health dence network systems report ))) OR ( health evidence network synthesis report ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( health dence network synthesis report ) OR ( health dence network systems report ))) or ( health evidence network synthesis report ))*".