Perhaps you should try some spelling variations:
network synthesis » network systems
substance network » distance network, substrate network, resistance network
evidence network » science network, guidance network, dence network
science networks » science network, sciences network, sequence networks
system report » system reform, system support, system reforms
health guide » earth guide, health grid, health side
health guido » health gindo, health grid, health guiding

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