Perhaps you should try some spelling variations:
networks synthesis » nets synthesis
network synthesis » network systems
networks systems » network systems, networks system, networked systems
evidence network » science network, dence network, incidence networks
guidance network » guide network, finance network, guided network
health impedance » health importance, health temperance, head impedance
health guidance » health finance, health substance
health science » health sciences
network system » network systems, networked systems
system report » system reform, system support, system recent

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