Perhaps you should try some spelling variations:
network synthesis » network systems
health evidence » health science
network system » network systems, networked systems
system report » system reform, system support, system reforms
health dence » health device, health science, health devices

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"((health dence) or (health evidence)) network synthesis report\") OR (\"((health dence) or (health evidence)) network system report\"))".
• Removing quotes may allow a broader search: (( ((health dence) or (health evidence)) network synthesis report ) OR ( ((health dence) or (health evidence)) network system report )).
• Adding a wildcard symbol may retrieve word variants: (("((health dence) or (health evidence)) network synthesis report") OR ("((health dence) or (health evidence)) network system report"))*.