Perhaps you should try some spelling variations:
yang guang » yang yang, yan guan, yang liang
long thanh » luong thanh, long han, long trinh
gene long » gene clone, gene one
thanh one » than one, than done, thats one
one mail » one mailer, e mail, one man
yan can » yan clan, man can, yan guan
a gene » a genre, a gender, a gentle
wang » wing, wan, lang

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 ((((yan can) OR (yang guang))) OR (yan cong)) a gene long thanh one mail ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((((yan can) or (yang guang))) or (yan cong)) a gene long thanh one mail ;*.