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