Perhaps you should try some spelling variations:
"heat resistance network system report" » "heat reluctance network system report", "heat resistance new system report", "heat resistance between system report", "least resistance network system report", "host resistance network system report", "heat resistant network system report", "heat resistance network systems report", "heat resistance networked systems report", "heat resistance network system support", "heat resistance network system recent"
"health evidence network synthesis report" » "health evidence network systems report", "health science network synthesis report", "health guidance network synthesis report", "health dence network synthesis report"
"health substance network system reform" » "health distance network system reform", "health substrate network system reform", "health distance networks system reform", "health substance network systems reform", "health substance networked systems reform"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("health evidence network synthesis report") OR ((("heat resistance network system report") OR ("health substance network system reform")))).
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• Adding a wildcard symbol may retrieve word variants: (("health evidence network synthesis report") or ((("heat resistance network system report") or ("health substance network system reform"))))*.