Perhaps you should try some spelling variations:
"health influence networks synthesis report" » "health inference networks synthesis report", "health reference networks synthesis report", "health sequence networks synthesis report", "health influence networks systems report", "health influence nets synthesis report", "heart influence networks synthesis report", "death influence networks synthesis report", "earth influence networks synthesis report"
"health inference network synthesis report" » "health inference networks synthesis report", "health conference networking synthesis report", "health inference network systems report", "health conference network synthesis report", "health reference network synthesis report", "health differences network synthesis report"
"health guidance network synthesis report" » "health guidance network systems report", "health finance network synthesis report", "health impedance network synthesis report", "health guided network synthesis report", "health evidence network synthesis report", "health substance network synthesis report"
"earth guide network synthesis report" » "earth guide network systems report", "earth guided network synthesis report", "earth side network synthesis report", "earth wide network synthesis report", "health guide network synthesis report", "search guide network synthesis report", "bath guide network synthesis report"
health science » health sciences
health dence » health device, health evidence, health devices

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