Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
trung tuan » trung thanh, trung tam, tran tuan
truong cua » truong ca, truong quan, truong cao
nhung cong » dung cong, thong cong, hang cong
so thiet » soc thiet, hoc thiet, hoa thiet
dan than » dan chan, ban than, dan toan
van than » van thanh, van thang, van tuan

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 ((trung tuan) or (truong cua)) nhung cong ((dan than) OR (van than)) cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so thiet tach - thanh ((trung tuan) OR (truong cua)) nhung cong ((dan than) OR (van than)) cap*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so thiet tach - thanh ((trung tuan) or (truong cua)) nhung cong ((dan than) OR (van than)) cap*".