Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
trung tuan » trung thanh, tran tuan, truong thanh
hoc thiet » hoc thieu, hoc thuyet, hoc hien
dung cong » dung trong
cong san » cong tac
san phan » san pham, van phan, sat phan
phan cac » nhan cach, phan dau, phan lap

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 tuan) OR (trung tam)) dung cong san phan cac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - thanh ((trung tuan) OR (trung tam)) dung cong san phan cac".
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - thanh ((trung tuan) OR (trung tam)) dung cong san phan cac*.