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

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("all-ireland under-21 world championship") OR ("all-ireland under-21 worlds championship"))) OR ("all-ireland under-1 world championship")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"all-ireland under-21 world championship\") OR (\"all-ireland under-21 worlds 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-21 worlds 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-21 worlds championship"))) or ("all-ireland under-1 world championship"))*.