Perhaps you should try some spelling variations:
"varying environments and operational definitions" » "varying environments and operational definition", "varying environments and operational decision", "learning environments and operational definitions", "working environments and operational definitions", "living environments and operational definitions", "making environments and operational definitions", "marketing environments and operational definitions"
"changing environments and operational definitions" » "changing environments and operational definition", "changing environments and operational decision", "changing environment and operational definitions", "learning environments and operational definitions", "computing environments and operational definitions"
"varying environment and operational definitions" » "varying environment and operational definition", "varying environment and operational decision", "learning environment and operational definitions", "making environment and operational definitions", "marketing environment and operational definitions"
"varying environments and operational conditions" » "varying environments and operational considerations", "varying environments and operational control", "learning environments and operational conditions", "working environments and operational conditions", "living environments and operational conditions", "making environments and operational conditions", "marketing environments and operational conditions"
"varying environments and operating conditions" » "learning environments and operating conditions", "working environments and operating conditions", "living environments and operating conditions", "varying environments and loading conditions", "making environments and operating conditions", "marketing environments and operating conditions"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("varying environments and operational definitions") OR ("changing environments and operational definitions"))) OR ("varying environment and operational definitions"))) OR ((("varying environments and operational conditions") OR ("varying environments and operating conditions")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"varying environments and operational definitions\") or (\"changing environments and operational definitions\"))) or (\"varying environment and operational definitions\"))) or (((\"varying environments and operational conditions\") OR (\"varying environments and operating conditions\"))))".
• Removing quotes may allow a broader search: (((((( varying environments and operational definitions ) or ( changing environments and operational definitions ))) or ( varying environment and operational definitions ))) or ((( varying environments and operational conditions ) OR ( varying environments and operating conditions )))).
• Adding a wildcard symbol may retrieve word variants: (((((("varying environments and operational definitions") or ("changing environments and operational definitions"))) or ("varying environment and operational definitions"))) or ((("varying environments and operational conditions") OR ("varying environments and operating conditions"))))*.