Perhaps you should try some spelling variations:
jeong yeon » jeong hyeok, jeang yean, jeong dahyeon
seung yeon » seung joon, seung won, seung youn
wang ying » wang yong, wang jing, wang ning
wang yang » wang yan, wang liang, wang yanling
test kit » test kits
yang ai » yang di, yang xi, yang yi
ai test » api test, i test, ii test
kit min » kim min, pit mine

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang ying) OR (wang yang)) yang ai test kit min ((jeong yeon) OR (seung yeon)) ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang ying) or (wang yang)) yang ai test kit min ((jeong yeon) or (seung yeon)) ;*.