Perhaps you should try some spelling variations:
jeong yeon » jeong hyeok, jeang yean, jeong dahyeon
seung yeon » seung joon, seung won, seung youn
test kaw » test a, test kit, test awt
wan yan » wang yan, nan yan, wai yan
yang ai » yang di, yang li, yang dali
yang yi » yang di, yang jui
yang xi » yang di, yang jui

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