Perhaps you should try some spelling variations:
thieu tach » thien hach, chiet tach, chieu sach
thong cong » trong cong, tong cong, thong thong
hoc thieu » toc thieu, hoc hien
hanh dinh » thanh dinh, hinh dinh, hanh tinh
dung cong » dung trong
van thanh » ban thanh, van tuan
thanh ban » thanh san, thanh van, thanh bac
dinh cu » dinh cuu, dinh chuc, dinh chau

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tach - hanh dinh cu ((dung cong) OR (thong cong)) van thanh ban~.
• Adding a wildcard symbol may retrieve word variants: hoc thieu tach - hanh dinh cu ((dung cong) or (thong cong)) van thanh ban*.