Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh tranh » canh tranh, hanh trinh, hanh trang
tranh van » tran van, trinh van, thanh van
hang nong » thang long, han tong
van toan » van tuan, van tan, van thanh
toan ban » van ban
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doi chi) or (hoc hien)) sach - hanh tranh van ((nhung cong) or (hang nong)) van toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doi chi) OR (hoc hien)) sach - hanh tranh van ((nhung cong) OR (hang nong)) van toan ban.
• Adding a wildcard symbol may retrieve word variants: ((doi chi) or (hoc hien)) sach - hanh tranh van ((nhung cong) or (hang nong)) van toan ban*.