Perhaps you should try some spelling variations:
network synthesis » network systems
substance network » distance network, substrate network, resistance network
evidence network » guidance network, dence network, incidence networks
sequence network » sequence networks, sequential network, recurrence network
science network » sciences network, science networks, science work
heart sequence » heart sequences, charts sequence, header sequence

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