Perhaps you should try some spelling variations:
ethan john » tian john
tuman john » dugan john, tian john, turn john
dang anh » duong anh
anh tuan » anh tran, dinh tuan, oanh tran
tuan hua » tan hua, tuan vu, yuan hui
hua ren » hua chen
von sam » von sa, von sap, von scham

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: dang anh tuan hua ren ((tuman john) OR (ethan john)) ((von sam) OR (kong (sar OR saur))) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dang anh tuan hua ren ((tuman john) or (ethan john)) ((von sam) or (kong (sar OR saur))) ;~".
• Adding a wildcard symbol may retrieve word variants: dang anh tuan hua ren ((tuman john) or (ethan john)) ((von sam) or (kong (sar OR saur))) ;*.