Perhaps you should try some spelling variations:
jeong dahyeon » jeong hyeok
seung yeon » jeong yeon, seung joon, seung won
wang yang » wang yan, wang liang, wang yanling
yang yang » wang yan
ein teil » ein test
kyaw min » kan min
ai test » api test, i test, ii test

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 yang yang ((ein teil) OR (ai test)) kyaw min ((seung yeon) OR (jeong dahyeon)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang yang ((ein teil) or (ai test)) kyaw min ((seung yeon) or (jeong dahyeon)) ;*.