Perhaps you should try some spelling variations:
thanh trung » thanh tung
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
trung cua » truong cua, trung tuan, trung cap
cong tan » cong thanh, cong ty, cong ha
cong tac » cong ty
toan ban » van ban

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 cong ((((cong tan) OR (cong san))) or (cong tac)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - thanh trung cua cong ((((cong tan) OR (cong san))) OR (cong tac)) toan ban*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thiet tach - thanh trung cua cong ((((cong tan) OR (cong san))) or (cong tac)) toan ban*".