Perhaps you should try some spelling variations:
about test » about tests, about texts, about trust
dong qian » gong qiang, ong kian, dong sin
qian wang » yiqian wang, qian rong, qian yan
out test » out west, root test, post test
yan guan » gan guan, yang guang, yihan guan
yan yuan » fang yuan, nan yan, yan clan
das cern » das ferne, das clan
hong yu » wong yue

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

• Performing a fuzzy search may retrieve terms with similar spellings: dong qian wang ((out test) OR (about test)) ((yan guan) or (((yan yuan) or (das cern)))) hong yu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: dong qian wang ((out test) OR (about test)) ((yan guan) OR (((yan yuan) OR (das cern)))) hong yu ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong qian wang ((out test) OR (about test)) ((yan guan) or (((yan yuan) or (das cern)))) hong yu ;".
• Adding a wildcard symbol may retrieve word variants: dong qian wang ((out test) OR (about test)) ((yan guan) or (((yan yuan) or (das cern)))) hong yu ;*.