Perhaps you should try some spelling variations:
jeong yeon » jeong hyeok, jeang yean, jeong dahyeon
seung yeon » seung joon, seung won, seung youn
wang wang » wang liang, wang yan, wang yong
wang yang » wang yan, wang liang, wang yanling
yang ai » yang di, yang xi, yang yi
ai test » api test, i test, ii test
test a » test _, test 4, test 5
a min » a main, a mini, a mine

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "wang wang yang ai test a min ((seung yeon) OR (jeong yeon)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang wang yang ai test a min ((seung yeon) OR (jeong yeon)) ;*.