Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thanh dung » thanh duong, thanh tung, thanh hung
thuong dan » huong dan, thuong han, thuong dam
so thiet » soc thiet, hoc thiet, hoa thiet
hoa dong » hoat dong, hoa cong, hoa doanh
dan phan » doan phan, dan chan, van phan
ha dong » hoat dong, van dong

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

• Performing a fuzzy search may retrieve terms with similar spellings: so thiet tach - thanh dung ((hoa dong) or (ha dong)) thuong dan phan tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so thiet tach - thanh dung ((hoa dong) OR (ha dong)) thuong dan phan tu.
• Adding a wildcard symbol may retrieve word variants: so thiet tach - thanh dung ((hoa dong) or (ha dong)) thuong dan phan tu*.