Perhaps you should try some spelling variations:
reformen von » formen von, reform von, referaten von
david hong » david ng
wang yang » wang yan, wang liang, wang yanling
yang wang » yang yang, yan wang, yang guang
hong than » hong tan, long thanh, hong hai
wang wei » zhang wei, wang zhi
form von » formen von

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 wang wei ((reformen von) OR (form von)) david hong than ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang wang wei ((reformen von) or (form von)) david hong than ;*.