Perhaps you should try some spelling variations:
core shapley » der shapley
gale shapley » gale charles
core samples » code samples, large samples, censored samples
john core » john corpe, john corse, john score

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: (( john ((core shapley) OR (gale shapley)) ) OR ( john core samples )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( john ((core shapley) OR (gale shapley)) ) or ( john core samples ))".
• Adding a wildcard symbol may retrieve word variants: (( john ((core shapley) OR (gale shapley)) ) or ( john core samples ))*.