Perhaps you should try some spelling variations:
canh trinh » canh tranh, hanh trinh, canh tinh
dien hinh » dien kinh, tien thinh, dien anh
trinh vat » trinh van, trinh luat, sinh vat
nhung don » nhung van, nhung bo
dung cong » dung trong
so dien » co dien, so dieu, so bien
van van » tan van, san van, van vat

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