Perhaps you should try some spelling variations:
sin dauer » seine dauer, die dauer, i dauer
dauer api » dauer als, dauer iii
api usage » a usage, iii usage
usage de » usage des, usages de, l'usage de
yang jun » yang jui, pang jun, yang jin
yang yi » yang jui
yang xi » yang jui
de mi » de ma, de mr, de ti
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: dong sin dauer api usage de mi ((((yang jun) OR (yang yi))) OR (((yang di) OR (yang xi)))) ;~.
• Adding a wildcard symbol may retrieve word variants: dong sin dauer api usage de mi ((((yang jun) or (yang yi))) or (((yang di) or (yang xi)))) ;*.