Perhaps you should try some spelling variations:
how slower » has slower, low lower
yan gang » yang guang, yang yang, yan liang
yan wang » yuan wang, yang yang, qian wang
der rede » der redner, der re
jong min » song min, song ming, cog min
gong min » song min, gong meng, song ming
how slow » how low, grow slow, too slow

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: wing ((yan gang) OR (yan wang)) der rede ((jong min) OR (gong min)) ((how slow) OR (how slower)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wing ((yan gang) OR (yan wang)) der rede ((jong min) or (gong min)) ((how slow) or (how slower)) ;~".
• Adding a wildcard symbol may retrieve word variants: wing ((yan gang) OR (yan wang)) der rede ((jong min) or (gong min)) ((how slow) or (how slower)) ;*.