Perhaps you should try some spelling variations:
yang guang » yang yang, yan guan, yang liang
wang yang » wang yan, wang liang, wang yanling
siew pei » siew hai, chew pei, siew ee
pei gang » pei yang, wei guang, der gang
long do » long d, longer do, long ago
long du » long d, long run, long did
gang 3 » gang _, lang 3, wang 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: ((wang yang) OR (yang guang)) (mah OR math) siew pei gang 3 ((long do) OR (long du)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yang) or (yang guang)) (mah or math) siew pei gang 3 ((long do) OR (long du)) ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang yang) or (yang guang)) (mah or math) siew pei gang 3 ((long do) OR (long du)) ;*.