Perhaps you should try some spelling variations:
yang yang » wang yang, wang yan
4.1 when » 6.1 when, 4.1 what, 4.1 why
yang jui » yang judy, yang yi
sin cas » sin cause, using cas, sin cain
cas 4.1 » case 4.1, cash 4.1, cast 4.1
when co » when cow, when do, when coal
co ging » so ging
yang xi » yang yi
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 cas 4.1 when co ging ((((yang yang) OR (yang xi))) OR (((yang jui) OR (yang di)))) ;~.
• Adding a wildcard symbol may retrieve word variants: dong sin cas 4.1 when co ging ((((yang yang) or (yang xi))) or (((yang jui) or (yang di)))) ;*.