"bút phép" meaning in Vietnamien

{
  "categories": [
    {
      "kind": "other",
      "name": "Noms communs en vietnamien",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Vietnamien",
      "orig": "vietnamien",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Composé de 筆 (bút) (pinceau) et de 法 (phép) (méthode)."
  ],
  "lang": "Vietnamien",
  "lang_code": "vi",
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "筆法"
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en vietnamien de l’art",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Calligraphie."
      ],
      "id": "fr-bút_phép-vi-noun-WILur~dY",
      "topics": [
        "art"
      ]
    }
  ],
  "word": "bút phép"
}

{
  "categories": [
    "Noms communs en vietnamien",
    "vietnamien"
  ],
  "etymology_texts": [
    "Composé de 筆 (bút) (pinceau) et de 法 (phép) (méthode)."
  ],
  "lang": "Vietnamien",
  "lang_code": "vi",
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "筆法"
  ],
  "senses": [
    {
      "categories": [
        "Lexique en vietnamien de l’art"
      ],
      "glosses": [
        "Calligraphie."
      ],
      "topics": [
        "art"
      ]
    }
  ],
  "word": "bút phép"
}