Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hung thang » cang thang, hung tran
cong thanh » dong thanh, cong trinh, cong tan
nang hang » nang sang, hang hang, cang thang
ho thiet » hoc thiet, hoa thiet, so thiet
cong tac » cong ty
can cau » van cau, ban cau, ca cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho thiet tach - ((nang hang) or (hung thang)) va nhung ((cong tac) or (cong thanh)) can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thiet tach - ((nang hang) OR (hung thang)) va nhung ((cong tac) OR (cong thanh)) can cau.
• Adding a wildcard symbol may retrieve word variants: ho thiet tach - ((nang hang) or (hung thang)) va nhung ((cong tac) or (cong thanh)) can cau*.