Perhaps you should try some spelling variations:
networks synthesis » networks systems, nets synthesis
network synthesis » network systems
evidence network » science network, guidance network, dence network
health evidence » health science
health sequence » heart sequence, health consequence, health science
health guidance » health finance

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 report ) OR ( ((health sequence) OR (health sequelae)) networks synthesis report ))) OR ( ((health guidance) OR (health substance)) network synthesis report )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( health evidence network synthesis report ) or ( ((health sequence) OR (health sequelae)) networks synthesis report ))) or ( ((health guidance) or (health substance)) network synthesis report ))".
• Adding a wildcard symbol may retrieve word variants: (((( health evidence network synthesis report ) or ( ((health sequence) OR (health sequelae)) networks synthesis report ))) or ( ((health guidance) or (health substance)) network synthesis report ))*.