Perhaps you should try some spelling variations:
defence network » defense network, defenses network, defense networks
health defence » health adherence, health reference, health terrence
systems report » system report, systems support, 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 defence network synthesis report ) OR ( health dense network systems report )).
• Adding a wildcard symbol may retrieve word variants: (( health defence network synthesis report ) or ( health dense network systems report ))*.