Vietnamese Wikipedia has an article on:

hiếu

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Pronunciation

(Hà Nội) IPA^(key): [hiəw˧˦]
(Huế) IPA^(key): [hiw˨˩˦]
(Saigon) IPA^(key): [hiw˦˥]

Etymology 1

Sino-Vietnamese word from 孝.

Noun

hiếu

filial piety
mourning after parent's death

Adjective

hiếu

filially pious

Derived terms

báo hiếu
bất hiếu
chí hiếu
Hiếu
hiếu đễ
hiếu nghĩa
hiếu thảo
hiếu thuận
hiếu tử
trung hiếu

Etymology 2

Doublet of háo.

This is the SV reading of the verbal form 好 (MC xawH, “to like, to be fond of”). This form probably originated from Central-Southern Vietnam and displaced Northern háo, which would be the expected reflex of 好 (MC xawH), as the "standard" Sino-Vietnamese reading. Compare cáo vs. kiếu, bảo vs. biểu, đào vs. điều.

Romanization

hiếu

Sino-Vietnamese reading of 好 (“to like”)

Derived terms