Perhaps you should try some spelling variations:
leong yeon » jeong yeon
seung yeon » jeong yeon, seung joon, seung won
wang yao » wang yan, yang yao, gang yao
yao yang » yang yang
test awt » test auf, test a
yang ii » yang di, yang xi, yang yi
ii test » ai test, i test, api test

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yao yang ii test awt mun ((leong yeon) or (seung yeon)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yao yang ii test awt mun ((leong yeon) OR (seung yeon)) ;*.