Perhaps you should try some spelling variations:
"during environmental and operational definitions" » "during environmental and operational definition", "during environmental and operational decision", "emerging environmental and operational definitions", "improving environmental and operational definitions", "changing environmental and operational definitions"
"exploring environmental and operational conditions" » "monitoring environmental and operational conditions", "engineering environmental and operational conditions", "exploring environmental and operating conditions", "exploring environmental and operational considerations", "exploring environmental and operational control"
"measuring environmental and operational conditions" » "monitoring environmental and operational conditions", "changing environmental and operational conditions", "measuring environmental and operating conditions", "measuring environmental and operational considerations", "measuring environmental and operational control"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"during environmental and operational definitions\") OR (((\"exploring environmental and operational conditions\") OR (\"measuring environmental and operational conditions\"))))".
• Removing quotes may allow a broader search: (( during environmental and operational definitions ) OR ((( exploring environmental and operational conditions ) OR ( measuring environmental and operational conditions )))).
• Adding a wildcard symbol may retrieve word variants: (("during environmental and operational definitions") OR ((("exploring environmental and operational conditions") OR ("measuring environmental and operational conditions"))))*.