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

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("varying environments and operational definitions") OR ("working environments and operational definitions"))) 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 (\"working environments and operational definitions\"))) 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 ( working environments and operational definitions ))) 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 ("working environments and operational definitions"))) or ((("varying environments and operational considerations") or ("learning environments and operational considerations"))))*.