Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thang cua » thong cua, hang cua, than cua
dung cong » dung trong
ho thiet » hoc thiet, hoa thiet, so thiet
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan ban » van ban

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 - hanh ((thang cua) or (((tang luan) OR (dung luan)))) dung cong tan toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thiet tach - hanh ((thang cua) OR (((tang luan) OR (dung luan)))) dung cong tan toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho thiet tach - hanh ((thang cua) or (((tang luan) OR (dung luan)))) dung cong tan toan ban*".