Perhaps you should try some spelling variations:
thanh tuong » thanh thuong, thanh tung, thanh huong
tuong tuong » tuong duong, trong tuong, duong truong
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
son thanh » ban thanh, van thanh
thanh lap » thanh san, phan lap, thanh hai

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

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