Perhaps you should try some spelling variations:
leong yeon » jeong yeon
seung yeon » jeong yeon, seung joon, seung won
wang yong » wang yang, wang hyoung, wang yan
yong yang » yang yang, dong yang, ying yang
test kaw » test a, test kit, test ke
test awt » test auf, test a
yang ai » yang di, yang xi, yang yi

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yong yang ai ((test kaw) or (test awt)) mun ((leong yeon) OR (seung yeon)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yong yang ai ((test kaw) OR (test awt)) mun ((leong yeon) OR (seung yeon)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yong yang ai ((test kaw) or (test awt)) mun ((leong yeon) OR (seung yeon)) ;*".