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

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