Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
dien tinh » diep tinh, bien tinh, dien hinh
trinh vat » trinh van, trinh luat, sinh vat
nhung don » nhung van, nhung bo
dung cong » dung trong
van toan » van tuan, van tan, van thanh
toan ban » van ban
so dien » co dien, so dieu, so bien

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

• Performing a fuzzy search may retrieve terms with similar spellings: so dien tinh - canh trinh vat ((nhung don) or (dung cong)) van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so dien tinh - canh trinh vat ((nhung don) OR (dung cong)) van toan ban.
• Adding a wildcard symbol may retrieve word variants: so dien tinh - canh trinh vat ((nhung don) or (dung cong)) van toan ban*.