Perhaps you should try some spelling variations:
health incidence » health incident, health science, health evidence
death incidence » growth incidence, dengue incidence
nets synthesis » net synthesis, dots synthesis, its synthesis
systems report » system report, systems support, systems recent
guide network » guided network, side network, wide network
health guide » health guido, earth guide, health grid

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 (death incidence)) nets synthesis report ) OR ( health guide network systems report )).
• Adding a wildcard symbol may retrieve word variants: (( ((health incidence) or (death incidence)) nets synthesis report ) or ( health guide network systems report ))*.