Perhaps you should try some spelling variations:
yang chang » ying chang, huang chang, yang yang
seung yeon » jeong yeon, seung joon, seung youn
wang yang » wang yan, wang liang, wang yanling
seung won » seung joon, seung youn, myung won
chang yi » chong yi, zhang yi, chang gui
test 4.3 » test 3.3, test 4.2, test 4.4
test 4 » 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 chang yi ((test 4.3) OR (test 4)) min ((seung yeon) OR (seung won)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yang chang yi ((test 4.3) or (test 4)) min ((seung yeon) OR (seung won)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang yang chang yi ((test 4.3) or (test 4)) min ((seung yeon) OR (seung won)) ;*.