Perhaps you should try some spelling variations:
networks synthesis » networks systems, nets synthesis
network synthesis » network systems
health incidence » health science, health evidence, path incidence
health incident » health including
death incidence » disease incidence, growth incidence, dengue incidence
health guide » health guido, health grid, health side
earth guide » search guide, bath guide, earth tide

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