1 (wiktionary) 2 (vi.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Core Words Familarize yourself with the 'core words'.
Compounds Expand your vocabulary by studying more complex words built by the 'core words'.
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KOREAN 3.0	Eng	Wordtype	Etym.	Gb	Vie
☆☆	ACT	Noun		勾当	hành vi, hành động
☆	IRREGULARITY; CORRUPTION	Noun	非理	不正之风，非法勾当，舞弊	sự phi lí