Perhaps you should try some spelling variations:
wang liang » wang yang
weng john » wong john, wrong john, king john
tran hua » tan hua, tuan hua, tran duc
ren weng » den weg
bonn ana » bonn a, bonn am, bonn und
bonn auf » bonn zur, bonn zum, bonn a
tuan vu » thanh vu, tuan hua

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 liang ((tran hua) OR (tuan vu)) ren weng john ((bonn ana) OR (bonn auf)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang liang ((tran hua) or (tuan vu)) ren weng john ((bonn ana) OR (bonn auf)) ;~".
• Adding a wildcard symbol may retrieve word variants: wang liang ((tran hua) or (tuan vu)) ren weng john ((bonn ana) OR (bonn auf)) ;*.