Perhaps you should try some spelling variations:
thanh china » than china, ghana china, han china
long thanh » luong thanh, long han, long trinh
wei yang's » yiwei wang's
wang long » wang yong, wang hong, wang lihong
wei yang » pei yang, wei wang, wei shang
jui cong » jui meng, li cong
jiu cong » li cong

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 long thanh china ((wei yang) OR (wei yang's)) ((jui cong) OR (jiu cong)) shu ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang long thanh china ((wei yang) or (wei yang's)) ((jui cong) OR (jiu cong)) shu ;~".
• Adding a wildcard symbol may retrieve word variants: wang long thanh china ((wei yang) or (wei yang's)) ((jui cong) OR (jiu cong)) shu ;*.