Perhaps you should try some spelling variations:
network synthesis » network systems
evidence network » guidance network, dence network, incidence networks
health impedance » health importance, health temperance, health imperative
science network » sciences network, science networks, science work
health science » health sciences
head impedance » head impedances, load impedance, end impedance

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