Perhaps you should try some spelling variations:
cheng chen » chang chen, chen zhen, cheng chu
chen young » chen yong, chen yang, chen chung
young john » kong john, wong john, young jean
thanh van » thanh vu
thanh dam » than daem
bonn shin » song shin, bonn ein
bonn mein » bonn ein

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

• Performing a fuzzy search may retrieve terms with similar spellings: long ((thanh van) OR (thanh dam)) cheng chen young john ((bonn shin) or (bonn mein)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: long ((thanh van) OR (thanh dam)) cheng chen young john ((bonn shin) OR (bonn mein)) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "long ((thanh van) OR (thanh dam)) cheng chen young john ((bonn shin) or (bonn mein)) ;".
• Adding a wildcard symbol may retrieve word variants: long ((thanh van) OR (thanh dam)) cheng chen young john ((bonn shin) or (bonn mein)) ;*.