Perhaps you should try some spelling variations:
lang ying » liang ying, huang ying, zhang ying
ying yang » yang yang, yin yang, ying chang
song bing » song ming, song byung, dong bin
per test » der tests, per cent, bar test
asr test » bar test, car test
der test » der tests, der text, der texte
kim song » kim young, kim eung

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 (asr test))) or (der test)) kim song bing su ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: lang ying yang ((((per test) OR (asr test))) OR (der test)) kim song bing su ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "lang ying yang ((((per test) OR (asr test))) or (der test)) kim song bing su ;*".