Perhaps you should try some spelling variations:
how slower » low lower
yan zhang » yuan chang, bin zhang, han chang
zhang der » zwang der, anhang der, zugang der
der rent » der re, der rede
jong min » gong min, song min, 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 zhang der rent jong min ((how slow) OR (((how slower) OR (has slower)))) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yan zhang der rent jong min ((how slow) or (((how slower) or (has slower)))) ;*.