Perhaps you should try some spelling variations:
liang xiang » lian xiang, liang ying, liang liying
wang liang » wang yang
thin lens » thin line, thin end
dong sign » among sign, dong bin
dann bin » dong bin
lens a » lens _, lens 2, lens 4
a thin » _ thin, 2 thin, 3 thin

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: wang liang xiang lens a thin lens ((((dann bin) OR (dong sin))) OR (dong sign)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang liang xiang lens a thin lens ((((dann bin) or (dong sin))) or (dong sign)) ;*.