Perhaps you should try some spelling variations:
assistance networks » assistance networked, resistance networks, resistances networks
networks synthesis » networks systems, nets synthesis
health assistance » health substance, cash assistance
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 evidence ((network synthesis) OR (network systems)) report ) OR ( health assistance networks synthesis report )).
• Adding a wildcard symbol may retrieve word variants: (( health evidence ((network synthesis) or (network systems)) report ) or ( health assistance networks synthesis report ))*.