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

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