Perhaps you should try some spelling variations:
yang ruckgang » und ruckgang, a ruckgang
ruckgang des » ruckgang der
rent liang » peng liang
wang yang » wang yan, wang liang, wang yanling
shang hai » shang kai, dang hai, chang ha
des rent » des real
liang li » ling li, qiang li, liang wei
hong yu » wong yue

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang ruckgang des rent liang li ((shang hai) or (hong yu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang ruckgang des rent liang li ((shang hai) OR (hong yu)) ;.
• Adding a wildcard symbol may retrieve word variants: wang yang ruckgang des rent liang li ((shang hai) or (hong yu)) ;*.