This patent search tool allows you not only to search the PCT database of about 2 million International Applications but also the worldwide patent collections. This search facility features: flexible search syntax; automatic word stemming and relevance ranking; as well as graphical results.

https://patentscope2.wipo.int/search/ja/detail.jsf?docId=WO2021130638&_cid=JP1-KQKTF3-90039-1