Perhaps you should try some spelling variations:
drei formen » die formen, zwei formen, durch formen
cohen david » cohen daniel, loshin david
wang liang » wang yang
der formen » der reformen, die formen, der form
john david » sahn david, juan david, jan david
wan wang » wen wang, yan wang, wang yang
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: wan wang liang ((drei formen) OR (der formen)) ((john david) OR (cohen david)) hong tan ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wan wang liang ((drei formen) or (der formen)) ((john david) OR (cohen david)) hong tan ;~".
• Adding a wildcard symbol may retrieve word variants: wan wang liang ((drei formen) or (der formen)) ((john david) OR (cohen david)) hong tan ;*.