Micromys erythrotis
Rare visitor: recorded only occasionally in this country
Range
Northern Vietnam and southern China
The Indochinese harvest mouse is a species of rodent in the genus Micromys, native to northern Vietnam and southern China. It differs from the Eurasian harvest mouse in having grey fur tinged with brown on the upper parts and a longer tail (Wikipedia, general species account).
The cached account is very short and gives no habitat, diet or breeding information.