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'.
Wordsense Learn about the wordsenses of the english term.

ETYMOLOGY

HAN VIET: thượng học 上学

KOREAN 3.0	Eng	Wordtype	Etym.	Gb	Vie
☆	GOING TO SCHOOL	Noun	登校	上学	việc đến trường