Perhaps you should try some spelling variations:
"working environments and computational considerations" » "working environments and additional considerations", "working environment and computational considerations", "work environments and computational considerations", "learning environments and computational considerations"
"working environments and operational considerations" » "working environments and additional considerations", "working environment and operational considerations", "work environments and operational considerations", "learning environments and operational considerations"
"varying environments and operational conditions" » "varying environments and operating conditions", "varying environments and operational definitions", "varying environments and operational control", "varying environment and operational conditions", "learning environments and operational conditions", "changing environments and operational conditions"

Try widening your search to All Fields.

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