Perhaps you should try some spelling variations:
van hoang » tran hoang, vu hoang, anh hoang
you liang » you xian, you liangzhi
hoang shu » hoang vu, cong shu, hoang sy
cong van » congo can, duong van, cong sun
yang li » yang lin, yang di, yang xi
li cong » li rong, li song, jiu cong
wang » wing, wan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (wang OR lang) yan ((yang li) or (you liang)) li cong van hoang shu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (wang OR lang) yan ((yang li) OR (you liang)) li cong van hoang shu ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(wang OR lang) yan ((yang li) or (you liang)) li cong van hoang shu ;*".