Perhaps you should try some spelling variations:
yang liang » wang liang, yan liang, yang guang
peng liang » wang liang, deng ziliang
yang yang » wang yang, wang yan
duong van » cong van, duong anh
yan yan » yan yuan, nan yan, wang yan
wang » wing, wan, lang
test » text, west, best

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 yan) OR (yang yang)) zhi (rest OR test) ((yang liang) OR (peng liang)) duong van ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang ((yan yan) or (yang yang)) zhi (rest or test) ((yang liang) OR (peng liang)) duong van ;~".
• Adding a wildcard symbol may retrieve word variants: wang ((yan yan) or (yang yang)) zhi (rest or test) ((yang liang) OR (peng liang)) duong van ;*.