Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
thanh tung » thanh cong
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hang cong » dang cong, hang nong, bang cong
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cao » toan cao, thai cao, than cap
va hang » van hang, va nang, va lang

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 chinh) or (thanh tung)) va hang cong tac than cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thiet tach - ((hanh chinh) OR (thanh tung)) va hang cong tac than cao.
• Adding a wildcard symbol may retrieve word variants: hoc thiet tach - ((hanh chinh) or (thanh tung)) va hang cong tac than cao*.