Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
trung tuan » trung thanh, trung tam, tran tuan
nhung cong » dung cong, thong cong, hang cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trung cua » truong cua, trung cap, dung cua
thanh lap » thanh san, phan lap, thanh van
thanh hai » thanh phan, thanh hoa, thanh san
cong ban » cong bang, cong san, cong tan

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