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

KOREAN 3.0 Eng Wordtype Etym. Gb Vie
☆ EXTRA; FREE ADDITION; BONUS Noun 附赠，赠品，搭头 sự khuyến mại, sự cho thêm, đồ khuyến mại, đồ cho thêm