Perhaps you should try some spelling variations:
"varying environments and operational considerations" » "varying environments and additional considerations", "varying environment and operational considerations", "working environments and operational considerations", "changing environments and operational considerations"
"learning environments and operational considerations" » "learning environments and additional considerations"
"varying environments and operational definitions" » "varying environments and operational decision", "varying environment and operational definitions", "working environments and operational definitions", "changing environments and operational definitions"
"varying environments and operational definition" » "varying environment and operational definition", "working environments and operational definition", "changing environments and operational definition"

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