Perhaps you should try some spelling variations:
song byung » song yun, sung myung, song inyoung
lang ying » liang ying, huang ying, zhang ying
ying yang » yang yang, yin yang, ying chang
song bing » song ming, dong bin, song jin
per test » der tests, per cent, asr test
der test » der tests, der text, der texte

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

• Performing a fuzzy search may retrieve terms with similar spellings: lang ying yang ((per test) or (der test)) kim ((song bing) OR (song byung)) su ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: lang ying yang ((per test) OR (der test)) kim ((song bing) OR (song byung)) su ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "lang ying yang ((per test) or (der test)) kim ((song bing) OR (song byung)) su ;".
• Adding a wildcard symbol may retrieve word variants: lang ying yang ((per test) or (der test)) kim ((song bing) OR (song byung)) su ;*.