Perhaps you should try some spelling variations:
wang oanh » wang yan, wang yang, dang anh
chen yang » chen rong
yang john » young john, king john, yang jin
tran hua » tuan hua, tran duc
bonn sam » bonn am, bonn a, bonn das
bonn zum » bonn zur
tan hua » tuan hua, tan chia, tan puay

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