When searching for multiple keywords, the search results do not meet expectations

When searching for multiple keywords, the search result is the union of keywords, not the intersection of keywords. Please help confirm whether this is the problem of “vaultwarden” or “bitwarden”? thank you

This is the web-vault which is not maintained by the Vaultwarden developers.

See Search your Vault | Bitwarden Help & Support for more information regarding the search functionality