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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Intangible assets (Details) ₫ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 VND (₫) item $ / ₫	Dec. 31, 2023 USD ($) item $ / ₫	Dec. 31, 2022 VND (₫)	Dec. 31, 2021 VND (₫)
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Number of reporting units | item	2	2
Advertising cost	₫ 1,266,417	$ 53.1	₫ 1,839,069	₫ 614,805
Convenience translation rate (USD to VND) | $ / ₫	23,866	23,866
License | Minimum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Estimated useful life	3 years 2 months	3 years 2 months
License | Maximum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Estimated useful life	3 years 4 months	3 years 4 months
Software | Minimum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Estimated useful life	3 years	3 years
Software | Maximum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Estimated useful life	8 years	8 years
Others | Minimum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Estimated useful life	3 years	3 years
Others | Maximum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Estimated useful life	15 years	15 years

X

- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 720
-SubTopic 35
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483406/720-35-50-1

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
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-Paragraph 1
-Publisher FASB
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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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