Perhaps you should try some spelling variations:
"all-ireland under-21 world championship" » "all-ireland defender-21 world championship", "all-ireland under-21 worlds championship", "all-ireland under-2 world championship", "all-ireland under-11 world championship"
"all-ireland under-1 world championship" » "all-ireland defender-1 world championship"

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"all-ireland under-21 world championship\") OR (\"all-ireland under-1 world championship\"))".
• Removing quotes may allow a broader search: (( all-ireland under-21 world championship ) OR ( all-ireland under-1 world championship )).
• Adding a wildcard symbol may retrieve word variants: (("all-ireland under-21 world championship") OR ("all-ireland under-1 world championship"))*.