Perhaps you should try some spelling variations:
things during » things using, things sharing, thing hiring
last things » last thing, first things, smart things
sudan debt » sudan der, sudan west
yan sudan » kano sudan, yan guan, yan yuan
debt last » debt law, debt cash, debt cost
long span » long han
lang yan » wang yan, wang yang, zhang yan
long sin » dong sin, long run, long did

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: lang yan sudan debt last things during ((((long sin) OR (long span))) OR (jong ho)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "lang yan sudan debt last things during ((((long sin) OR (long span))) or (jong ho)) ;~".
• Adding a wildcard symbol may retrieve word variants: lang yan sudan debt last things during ((((long sin) OR (long span))) or (jong ho)) ;*.