Perhaps you should try some spelling variations:
"Health dense networks synthesis report" » "Health dense network synthesis report", "Health dense networks systems report", "Health dense nets synthesis report"
"Health gene networks synthesis report" » "Health gene network synthesis report", "Health gene networks systems report", "Health gene nets synthesis report"
"health dence network systems report" » "health dence network system report", "health dence network systems support", "health dence network systems recent", "health dense network systems report", "health defence network systems report", "health device network systems report", "health evidence network systems report", "health science network systems report"
health dense » healthy sense, health disease, health device
health gene » health genes, health gender, health agent

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("Health dense networks synthesis report") OR ("Health gene networks synthesis report"))) OR ("health dence network systems report")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"Health dense networks synthesis report\") OR (\"Health gene networks synthesis report\"))) or (\"health dence network systems report\"))".
• Removing quotes may allow a broader search: (((( Health dense networks synthesis report ) OR ( Health gene networks synthesis report ))) or ( health dence network systems report )).
• Adding a wildcard symbol may retrieve word variants: (((("Health dense networks synthesis report") OR ("Health gene networks synthesis report"))) or ("health dence network systems report"))*.