Webster's Revised Unabridged Dictionary · 1913

Indochinese

Indochinese , proper adjective

[Indo- + Chinese.]

1.
Of or pertaining to Indo-China (i. e., Farther India, or India beyond the Ganges).
2.
Of or pert. to the Mongoloid races of India, esp. Farther India, or designating, or of, their languages.
Tradition and comparative philology agree in pointing to northwestern China, between the upper courses of the Yang-tsekiang and of the Ho-ang-ho, as the original home of the Indo-Chinese race. — Census of India, 1901

Also: Indo-Chinese