Perhaps you should try some spelling variations:
duong oanh » duong anh, duong van
tran china » tuan china, than china, trade china
oanh tran » anh tran, anh tuan, binh tran
wang hui » wang hua, wang zhi, wang he
wang wei » zhang wei, wang zhi
yang yi » yang xi, yang jui
fall » all, hall, full

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

• Performing a fuzzy search may retrieve terms with similar spellings: duong oanh tran china fall ((yang yi) OR (yang di)) ((wang hui) OR (wang wei)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "duong oanh tran china fall ((yang yi) OR (yang di)) ((wang hui) OR (wang wei)) ;".
• Adding a wildcard symbol may retrieve word variants: duong oanh tran china fall ((yang yi) OR (yang di)) ((wang hui) OR (wang wei)) ;*.