Perhaps you should try some spelling variations:
und ruckgang » der ruckgang, und zugang, und ruckzug
ruckgang des » ruckgang der
des realen » der realen
wang und » zwang und, gang und, lang und
qiang li » liang li, qiang niu, ling li
wong yue » hong yu
wang yue » wang hua, wang yan, wang he

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang und ruckgang des realen qiang li ((dang hai) or (((wong yue) or (wang yue)))) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang und ruckgang des realen qiang li ((dang hai) OR (((wong yue) OR (wang yue)))) ;.
• Adding a wildcard symbol may retrieve word variants: wang und ruckgang des realen qiang li ((dang hai) or (((wong yue) or (wang yue)))) ;*.