Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trung cap » truong cao, trung tam
trung lap » truong lam, truong lop, trung tam
dung cong » dung trong
dan than » dan chan, van than, dan toan
ban than » ban thanh, van thanh, ban hang

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 - hanh ((trung cap) or (trung lap)) dung cong ((dan than) or (ban than)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh ((trung cap) OR (trung lap)) dung cong ((dan than) OR (ban than)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh ((trung cap) or (trung lap)) dung cong ((dan than) or (ban than)) cau*.