Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
dung cong » dung trong
ho thiet » hoc thiet, hoa thiet, so thiet
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh
anh ban » anh bang, anh bai, anh van
ban su » ban sua, dan su, van su

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 - anh ban su dung cong ((dan toan) or (van toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho thiet tach - anh ban su dung cong ((dan toan) OR (van toan)) cau*.