Perhaps you should try some spelling variations:
thiet tach » chiet tach, thien hach, thuat tach
hoc thiet » hoc thieu, hoc thuyet, hoc hien
hanh hang » thanh hang, hang hang, hanh han
dung cong » dung trong
cong dan » cong san, cong tan, huong dan
than cau » toan cau, phan cau, than cap
toan ban » van ban
va dung » van dung, va duong, vat dung

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