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Chau, T.M. 2018. Highland Hill tribe language - an extinct language system needed to be saved. HO CHI MINH CITY OPEN UNIVERSITY JOURNAL OF SCIENCE - SOCIAL SCIENCES. 8, 1 (Dec. 2018), 3–7. DOI:https://doi.org/10.46223/HCMCOUJS.soci.en.8.1.275.2018.