Bird in Vietnam with Black-scaled Underparts

What is that bird in Vietnam with black-scaled underparts?

1/ Dusky thrush (Turdus eunomus) 
2/ Dark-sided thrush (Zoothera marginata)

3/ White's thrush (Zoothera aurea)
4/ Scaly thrush (Zoothera dauma) 

Vietnam Travel Guide

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Vietnam Travel Tips

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