Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
trung tuan » trung thanh, trung tam, tran tuan
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trung cua » truong cua, trung cap, dung cua
hang cong » dang cong, hang nong, bang cong
dan toan » van toan, dan than, manh toan
dan chan » dan gian, dan ca, van chat

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