Perhaps you should try some spelling variations:
how slower » has slower, how slow, low lower
wang kong » wang yong, hong kong, wang yang
wang hong » wang yong, wang hyoung, wang lihong
song lean » using lean, going lean
sind lean » using lean, sind ein
heng der » ding der
der rent » der re, der rede

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 kong) OR (wang hong)) heng der rent ((song lean) OR (sind lean)) how slower ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang kong) OR (wang hong)) heng der rent ((song lean) or (sind lean)) how slower ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang kong) OR (wang hong)) heng der rent ((song lean) or (sind lean)) how slower ;*.