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

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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 considerations") OR ("varying environments and additional 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 considerations\") OR (\"varying environments and additional considerations\"))) or (\"learning environments and operational considerations\"))))".
• Removing quotes may allow a broader search: (( varying environments and operational definitions ) or ((((( varying environments and operational considerations ) OR ( varying environments and additional 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 considerations") OR ("varying environments and additional considerations"))) or ("learning environments and operational considerations"))))*.