Perhaps you should try some spelling variations:
hard things » hard thing, bad things, smart things
yang guang » yang yang, yan guan
yang liang » wang liang, yan liang, yang yang
wang yang » wang yan, wang liang, wang yanling
3.2 hard » 2.2 hard, 3.1 hard, 3.3 hard
things a » things _, things 1
sin » sign, sind, skin

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: lang ((yang guang) OR (yang liang)) 3.2 hard things a ((wang yang) OR (dong sin)) ;~.
• Adding a wildcard symbol may retrieve word variants: lang ((yang guang) or (yang liang)) 3.2 hard things a ((wang yang) or (dong sin)) ;*.