"ôn cố tri tân" meaning in Vietnamese

{
  "etymology_templates": [
    {
      "args": {
        "1": "vi",
        "2": "Sino-Vietnamese words"
      },
      "expansion": "",
      "name": "categorize"
    },
    {
      "args": {
        "1": "溫故知新"
      },
      "expansion": "Sino-Vietnamese word from 溫故知新",
      "name": "vi-etym-sino"
    }
  ],
  "etymology_text": "Sino-Vietnamese word from 溫故知新.",
  "head_templates": [
    {
      "args": {
        "1": "vi",
        "2": "idiom"
      },
      "expansion": "ôn cố tri tân",
      "name": "head"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Sino-Vietnamese words",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Vietnamese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "One should be able to derive new understanding while revising what one has learned."
      ],
      "id": "en-ôn_cố_tri_tân-vi-phrase-vdSKik~o",
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ʔon˧˧ ko˧˦ t͡ɕi˧˧ tən˧˧]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[ʔoŋ˧˧ kow˨˩˦ ʈɪj˧˧ təŋ˧˧]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[ʔoŋ˧˧ kow˦˥ ʈɪj˧˧ təŋ˧˧]",
      "tags": [
        "Hồ-Chí-Minh-City"
      ]
    }
  ],
  "word": "ôn cố tri tân"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "vi",
        "2": "Sino-Vietnamese words"
      },
      "expansion": "",
      "name": "categorize"
    },
    {
      "args": {
        "1": "溫故知新"
      },
      "expansion": "Sino-Vietnamese word from 溫故知新",
      "name": "vi-etym-sino"
    }
  ],
  "etymology_text": "Sino-Vietnamese word from 溫故知新.",
  "head_templates": [
    {
      "args": {
        "1": "vi",
        "2": "idiom"
      },
      "expansion": "ôn cố tri tân",
      "name": "head"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "phrase",
  "senses": [
    {
      "categories": [
        "Sino-Vietnamese words",
        "Vietnamese entries with incorrect language header",
        "Vietnamese idioms",
        "Vietnamese lemmas",
        "Vietnamese terms with IPA pronunciation"
      ],
      "glosses": [
        "One should be able to derive new understanding while revising what one has learned."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ʔon˧˧ ko˧˦ t͡ɕi˧˧ tən˧˧]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[ʔoŋ˧˧ kow˨˩˦ ʈɪj˧˧ təŋ˧˧]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[ʔoŋ˧˧ kow˦˥ ʈɪj˧˧ təŋ˧˧]",
      "tags": [
        "Hồ-Chí-Minh-City"
      ]
    }
  ],
  "word": "ôn cố tri tân"
}