Perhaps you should try some spelling variations:
lang yanling » wang yanling, wang yangming, zhang yunling
yanling yang » yang yang, ying yang
yera test » der test, meta test
beta test » meta test, data test, beta testing
kim song » kim young, kim eung
rong su » cong sun, jeong su, yong suk
rong yu » hong yu, wong yue, song yun

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

• Performing a fuzzy search may retrieve terms with similar spellings: lang yanling yang ((yera test) OR (beta test)) kim song ((rong su) or (rong yu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: lang yanling yang ((yera test) OR (beta test)) kim song ((rong su) OR (rong yu)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "lang yanling yang ((yera test) OR (beta test)) kim song ((rong su) or (rong yu)) ;*".