Perhaps you should try some spelling variations:
wang kong » wang yong, wang hong, hong kong
kong heng » kong hang, kong hong, dong sheng
song lean » using lean, going lean
sind lean » using lean, sind ein
der rent » der re
der rede » der redner, der re
how slow » how slower, grow slow, too slow
how low » how long

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