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