Perhaps you should try some spelling variations:
wang oanh » wang yan, wang yang, dang anh
yang john » young john, king john, yang jun
tran hua » tuan hua, tran duc
yang jin » yang jie, yang jun, ying jin
bonn sam » bonn am, bonn zum, bonn das
tan hua » tuan hua, wang hua, tan chia
bonn a » bonn am, bonn _, bon a

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang oanh ((tran hua) or (tan hua)) chen ((yang john) or (yang jin)) ((bonn sam) OR (bonn a)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang oanh ((tran hua) OR (tan hua)) chen ((yang john) OR (yang jin)) ((bonn sam) OR (bonn a)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang oanh ((tran hua) or (tan hua)) chen ((yang john) or (yang jin)) ((bonn sam) OR (bonn a)) ;".
• Adding a wildcard symbol may retrieve word variants: wang oanh ((tran hua) or (tan hua)) chen ((yang john) or (yang jin)) ((bonn sam) OR (bonn a)) ;*.