Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hanh trung » thanh trung, hanh trang, manh trung
hoc thiet » hoc thieu, hoc thuyet, hoc hien
cong ban » cong bang, cong san, cong tan
ban khan » ban than, ban nhan, ban chan
khan cap » khan ap, than cap, khoan cam
di ung » do ung, vi ung, di chung
de ung » do ung, ke ung

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 ((di ung) or (de ung)) cong ban khan cap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - hanh trung ((di ung) OR (de ung)) cong ban khan cap.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - hanh trung ((di ung) or (de ung)) cong ban khan cap*.