Perhaps you should try some spelling variations:
network synthesis » network systems
guidance network » guide network, finance network, impedance network
health evidence » health science
health sciences » earth sciences
health guidance » health finance, health substance

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) OR (health sciences)) network synthesis report ) OR ( health guidance network synthesis report )).
• Adding a wildcard symbol may retrieve word variants: (( ((health evidence) or (health sciences)) network synthesis report ) or ( health guidance network synthesis report ))*.