Perhaps you should try some spelling variations:
sudan debt » sudan der, sudan west
amin hong » min hong, among hong, tin hong
hong than » hong tan, long thanh, hong hai
yang yao » yang yang, wang yan, yang fan
yang yi » yang xi, yang jui
yang ka » yang fan
3 sudan » _ sudan, im sudan, _ sudano
debt a » debt _
ai 3 » aim 3, ai _, a 3

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: ((((yang yi) OR (((yang ka) OR (yang yao))))) OR (yang di))ai 3 sudan debt a amin hong than ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((yang yi) or (((yang ka) OR (yang yao))))) or (yang di))ai 3 sudan debt a amin hong than ;~".
• Adding a wildcard symbol may retrieve word variants: ((((yang yi) or (((yang ka) OR (yang yao))))) or (yang di))ai 3 sudan debt a amin hong than ;*.