Perhaps you should try some spelling variations:
juan rene » juan rana
juan meng » jui meng, yuan ming
song ming » song bing, song min, gong min
yan minh » tuan minh, sang minh, yang mind
cong van » congo can, duong van, cong sun
yan zi » yan zhi, yuan zi, ban zi
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 zi ((juan rene) OR (juan meng)) ((yan minh) OR (song ming)) cong van ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan zi ((juan rene) OR (juan meng)) ((yan minh) or (song ming)) cong van ;~".
• Adding a wildcard symbol may retrieve word variants: wang yan zi ((juan rene) OR (juan meng)) ((yan minh) or (song ming)) cong van ;*.