like: chu kỳ hủy biến
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exact:
VNEN 
chu kỳ hủy biến * ☊ 
decay period * ☊
[ chu ] : see châu
[ kỳ ] : (1) term, period, session; issue, number (of a periodical); (2) strange, odd, eccentric; (3) until; (4) chess; (5) flag; (6) to request, hope for; (7) to rub
[ hủy ] : to destroy, cancel, reverse
[ biến ] : (1) to disappear, vanish; (2) to change, convert; variable; (3) catastrophe, disaster, calamity; (4) to spread, distribute