Perhaps you should try some spelling variations:
ersten thing » ersten teil
ersten teils » erster teil, ersten welle
yang sudan » kano sudan, yang rudai
sudan debt » sudan der, sudan west
wang yang » wang yan, wang liang, wang yanling
zhang wei » zhen wei
dong » doing, long, done

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 sudan debt ((ersten thing) OR (ersten teils)) hiring ((dong sin) OR (zhang wei)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang sudan debt ((ersten thing) or (ersten teils)) hiring ((dong sin) or (zhang wei)) ;*.