Perhaps you should try some spelling variations:
yan ruckgang » a ruckgang, der ruckgang, und ruckgang
ruckgang des » ruckgang der
des ansatzes » des einsatzes, des datensatzes, des gesetzes
thing ji » thing _, thing 3, thing 17
wan yan » wang yan, nan yan, wai yan
jing ji » ying jin
dong di » dong sin

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "wan yan ruckgang des ansatzes ((thing ji) OR (jing ji)) dong di ;~".
• Adding a wildcard symbol may retrieve word variants: wan yan ruckgang des ansatzes ((thing ji) OR (jing ji)) dong di ;*.