Perhaps you should try some spelling variations:
khien bang » phien ban, khien dong
thien ban » thien bang, thien van, phien ban
tranh vat » trinh vat, tranh va, tranh van
dung cong » dung trong
vat dung » van dung, va dung, viet dung
cong van » cong vang, cong san, song van
ban cau » bang cau, ban can, van cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((khien bang) or (thien ban)) - canh tranh vat dung cong van ban cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((khien bang) OR (thien ban)) - canh tranh vat dung cong van ban cau.
• Adding a wildcard symbol may retrieve word variants: toc ((khien bang) or (thien ban)) - canh tranh vat dung cong van ban cau*.