Perhaps you should try some spelling variations:
networks synthesis » networks systems, nets synthesis
"health evidence network synthesis report" » "health science network synthesis report", "health guidance network synthesis report", "health dence network synthesis report"
death incidence » disease incidence, growth incidence, dengue incidence
health science » health sciences
"health guide network systems report" » "health guide network system report", "health guide network systems support", "health guide network systems recent", "health guided network systems report", "health side network systems report", "health wide network systems report", "health guido network systems report", "earth guide network systems report", "health grid network systems report"
"health gridd network synthesis report" » "health grid network synthesis report", "health guided network synthesis report", "health grid networks synthesis report", "health guido network synthesis report", "health great network synthesis report"
"health guide network synthesis report" » "health guided network synthesis report", "health side network synthesis report", "health wide network synthesis report", "health guido network synthesis report", "earth guide network synthesis report", "health grid network synthesis report"

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 synthesis report") OR ("((death incidence) or (health science)) networks synthesis report"))) OR ((("health gridd network synthesis report") OR ((("health guide network synthesis report") OR ("health guide network systems report")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"health evidence network synthesis report\") or (\"((death incidence) or (health science)) networks synthesis report\"))) or (((\"health gridd network synthesis report\") or (((\"health guide network synthesis report\") OR (\"health guide network systems report\"))))))".
• Removing quotes may allow a broader search: (((( health evidence network synthesis report ) or ( ((death incidence) or (health science)) networks synthesis report ))) or ((( health gridd network synthesis report ) or ((( health guide network synthesis report ) OR ( health guide network systems report )))))).
• Adding a wildcard symbol may retrieve word variants: (((("health evidence network synthesis report") or ("((death incidence) or (health science)) networks synthesis report"))) or ((("health gridd network synthesis report") or ((("health guide network synthesis report") OR ("health guide network systems report"))))))*.