Perhaps you should try some spelling variations:
networks synthesis » networks systems, nets synthesis
network synthesis » network systems
health incidence » death incidence, health incident, health science
dengue incidence » age incidence
health guide » health guido, earth guide, health side
health grid » health guido, health gis, health good

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 (dengue incidence)) networks synthesis report ) OR ( ((health guide) OR (health grid)) network synthesis report ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((health incidence) or (dengue incidence)) networks synthesis report ) or ( ((health guide) OR (health grid)) network synthesis report ))*".