Perhaps you should try some spelling variations:
thiet danh » thien danh, thien anh, thien dang
hoc thiet » hoc thieu, hoc thuyet, hoc hien
tranh van » tran van, trinh van, thanh van
van nhung » van nhuong, va nhung, van hung
cong tan » cong san, cong thanh, cong ty
cong tac » cong ty
can cau » ban cau, ca cau, cac cau
van cau » van dau, van hau, van chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thiet danh - canh tranh van nhung ((cong tan) or (cong tac)) ((can cau) or (van cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet danh - canh tranh van nhung ((cong tan) OR (cong tac)) ((can cau) OR (van cau)).
• Adding a wildcard symbol may retrieve word variants: hoc thiet danh - canh tranh van nhung ((cong tan) or (cong tac)) ((can cau) or (van cau))*.