Perhaps you should try some spelling variations:
how slower » has slower, low lower
yan gang » yan wang, yang guang, yang yang
der rent » der rede
jong min » song min, song ming, cog min
gong min » song min, gong meng, song ming
how slow » how low, grow slow, too slow
wang » wing, wan, lang

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