Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc thien » hoc thieu, hoc thiet, hoc tien
tranh van » tran van, trinh van, thanh van
van nhung » van nhuong, va nhung, van hung
ban than » ban thanh, van thanh, ban hang
ban hanh » ban hang

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 thien) OR (hoc hien)) hach - hanh tranh van nhung cong ((ban than) OR (ban hanh)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thien) OR (hoc hien)) hach - hanh tranh van nhung cong ((ban than) or (ban hanh)) cau~".
• Adding a wildcard symbol may retrieve word variants: ((hoc thien) OR (hoc hien)) hach - hanh tranh van nhung cong ((ban than) or (ban hanh)) cau*.