Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
nang hang » nang sang, hang hang, cang thang
dung cong » dung trong
tran chau » tranh chap, tran huu
ho thiet » hoc thiet, hoa thiet, so thiet
cong tan » cong tac, cong san, cong thanh
va dung » van dung, va duong, vat dung
can cau » van cau, ca cau, cac cau
ban cau » bang cau, ban can, van 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 va dung cong tan ((((can cau) or (tran chau))) or (ban cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thiet tach - nang hang va dung cong tan ((((can cau) OR (tran chau))) OR (ban cau)).
• Adding a wildcard symbol may retrieve word variants: ho thiet tach - nang hang va dung cong tan ((((can cau) or (tran chau))) or (ban cau))*.