Perhaps you should try some spelling variations:
thiet tach » chiet tach, thuat tach
thien hach » thien thanh, hien hanh
hanh trinh » canh tranh, hanh chinh
trinh cua » tinh cua, trinh luat, trinh quan
nhung don » nhung van, nhung bo
hang nong » thang long, han tong
van toan » van tuan, van tan, van thanh
toan cau » toan cao, toan ban, toan tap

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thiet tach) OR (thien hach)) - hanh trinh cua ((nhung don) OR (hang nong)) van toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thiet tach) OR (thien hach)) - hanh trinh cua ((nhung don) or (hang nong)) van toan cau~".
• Adding a wildcard symbol may retrieve word variants: hoc ((thiet tach) OR (thien hach)) - hanh trinh cua ((nhung don) or (hang nong)) van toan cau*.