'A dream ago perhaps. Ornament is for joy.'- comments on time, reminds the reader of how much they have lost, shows how they are no longer able to experience happiness.
'bones were charred'- short sentences, blunt force of heavy images.
'peaceful clouds'- 'peaceful', transferred epithet, the adjective can't really refer to the clouds (describing the people).
'bombs smashed those mirrors'- onomatopoeia, violent verb 'smashed'. Abrupt destruction.
'moths in the moonlight.'- metaphor shows the beauty, softness and vulnerability of the Vietnamese. The use of the alliteration shows this.
'who can say? its silent now'- caesura (?) ends with a rhetorical question/ all the previous questions have not been answered.- silence is the loss of culture. 'it is' firmly in the present tense.'- it comes before the end of the poem, reader left to consider.