"hư từ" meaning in Vietnamese

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  "etymology_text": "Sino-Vietnamese word from 虛詞.",
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        "3": "",
        "4": "",
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      "expansion": "hư từ",
      "name": "head"
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    {
      "args": {},
      "expansion": "hư từ",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
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      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
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            "Entry maintenance"
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        },
        {
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          "langcode": "vi",
          "name": "Grammar",
          "orig": "vi:Grammar",
          "parents": [
            "Linguistics",
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
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        }
      ],
      "glosses": [
        "function word"
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      "id": "en-hư_từ-vi-noun-5haicfIu",
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      "raw_glosses": [
        "(grammar) function word"
      ],
      "related": [
        {
          "word": "thực từ"
        }
      ],
      "topics": [
        "grammar",
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[hɨ˧˧ tɨ˨˩]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[hɨ˧˧ tɨ˦˩]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[hɨ˧˧ tɨ˨˩]",
      "note": "Saigon"
    }
  ],
  "word": "hư từ"
}

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  "etymology_text": "Sino-Vietnamese word from 虛詞.",
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      "expansion": "hư từ",
      "name": "head"
    },
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      "args": {},
      "expansion": "hư từ",
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    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "related": [
    {
      "word": "thực từ"
    }
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      "raw_glosses": [
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      ],
      "topics": [
        "grammar",
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[hɨ˧˧ tɨ˨˩]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[hɨ˧˧ tɨ˦˩]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[hɨ˧˧ tɨ˨˩]",
      "note": "Saigon"
    }
  ],
  "word": "hư từ"
}