Perhaps you should try some spelling variations:
wang liang » wang yang
data which » data while
chung here » chung hee, change here, chung yee
yang yang » wang yang
text data » text das, context data, textual data
chung h » chun h, chung _, chung hee
a text » a test
ya a » a a, y a, ye a

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 yang) OR (wang liang))) OR (wang yan)) ya a text data which ((chung h) OR (chung here)) ;~.
• Adding a wildcard symbol may retrieve word variants: ((((yang yang) or (wang liang))) or (wang yan)) ya a text data which ((chung h) or (chung here)) ;*.