Perhaps you should try some spelling variations:
drei formen » die formen, zwei formen, durch formen
yang liang » wang liang, yan liang, yang yang
der formen » der reformen, die formen, der form
david hong » david ng
wang yang » wang yan, wang liang, wang yanling
von david » john david, ben david, jan david
tan » than

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 yang liang ((drei formen) OR (der formen)) von david hong tan ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang liang ((drei formen) or (der formen)) von david hong tan ;*.