Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thanh tung » thanh cong
tung tuong » tuong tuong, tung truong, tuong duong
dung cong » dung trong
son thanh » ban thanh, van thanh
thanh lap » thanh san, phan lap, thanh hai
so thiet » soc thiet, hoc thiet, hoa thiet

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 tung tuong ((trong cong) or (dung cong)) son thanh lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so thiet tach - thanh tung tuong ((trong cong) OR (dung cong)) son thanh lap.
• Adding a wildcard symbol may retrieve word variants: so thiet tach - thanh tung tuong ((trong cong) or (dung cong)) son thanh lap*.