Perhaps you should try some spelling variations:
sudan debt » sudan der, sudan west
hong than » hong tan, long thanh
hong hai » shang hai, zhong tai, dang hai
yang yi » yang xi, yang jui
yang ka » yang fan, yang yao
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 di))ai 3 sudan debt a amin ((hong than) OR (hong hai)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((yang yi) or (yang ka))) or (yang di))ai 3 sudan debt a amin ((hong than) OR (hong hai)) ;~".
• Adding a wildcard symbol may retrieve word variants: ((((yang yi) or (yang ka))) or (yang di))ai 3 sudan debt a amin ((hong than) OR (hong hai)) ;*.