Perhaps you should try some spelling variations:
yan liang » yang liang, wang liang, you liang
build dsm » build m, build vs, build us
dsm klang » den klang, der klang
yan guan » gan guan, yan yuan, yang guang
langer a » lander a, langer _, langer als
longer a » longer _
klang 3 » klang 31, klang _, lang 3

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: ((yan liang) OR (yan guan)) can build dsm klang 3 ((langer a) OR (longer a)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((yan liang) or (yan guan)) can build dsm klang 3 ((langer a) OR (longer a)) ;~".
• Adding a wildcard symbol may retrieve word variants: ((yan liang) or (yan guan)) can build dsm klang 3 ((langer a) OR (longer a)) ;*.