Perhaps you should try some spelling variations:
seung yeon » jeong yeon, seung joon, seung won
wang ying » wang yang, wang yong, wang jing
ying yang » yang yang, yin yang, ying chang
api test » i test, ii test
ai test » i test, ii test, ein test
a mine » _ mine, a mini, a mile
a min » a main, a mini, a mind

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 yang ((ai test) OR (api test)) ((a min) OR (a mine)) seung yeon ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ying yang ((ai test) OR (api test)) ((a min) or (a mine)) seung yeon ;~".
• Adding a wildcard symbol may retrieve word variants: wang ying yang ((ai test) OR (api test)) ((a min) or (a mine)) seung yeon ;*.