add_query_args more than 1 value

  • i wanted to allow filtering on my page so i created links and echoed add_query_args
    so if the url was example.com
    it now became example.com/?taxonomy1=term1

    the problem is if they now choose another value of key1 it resets the url.
    i wanted it to become /?taxonomy1=term1+term2

    anyone know how to fix this?

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