Archaeological evidence for the presence of agriculture in northern Indochina (northern Vietnam, Laos, and other nearby areas) dates back to only about 4,000 years ago (2,000 BC), with agriculture ultimately being introduced from further up to the north in the Yangtze valley where it has been dated to 6,000 B.P.
ˌɑːɹkiːəlˈɑːdʒɪkəl ˈɛvɪdəns fɚðə pɹˈɛzəns ʌv ˈæɡɹɪkˌʌltʃɚɹ ɪn nˈɔːɹðɚn ˌɪndoʊtʃˈaɪnə nˈɔːɹðɚn vˌiːətnˈɑːm, lˈaʊz, ænd ˈʌðɚ nˈɪɹbaɪ ˈɛɹiəz dˈeɪts bˈæk tʊ ˈoʊnli ɐbˌaʊt fˈoːɹ,zˈiəɹoʊzˈiəɹoʊ zˈiəɹoʊ jˈɪɹz ɐɡˈoʊ tˈuː,zˈiəɹoʊzˈiəɹoʊ zˈiəɹoʊ bˌiːsˈiː, wɪð ˈæɡɹɪkˌʌltʃɚɹ ˈʌltᵻmətli bˌiːɪŋ ˌɪntɹədˈuːst fɹʌm fˈɜːðɚɹ ˌʌp tə ðə nˈɔːɹθ ɪnðə jˈɑːŋtsi vˈæli wˌɛɹ ɪt hˈæzbiːn dˈeɪɾᵻd tə sˈɪks,zˈiəɹoʊzˈiəɹoʊ zˈiəɹoʊ bˈiː.pˈiː.