Perhaps you should try some spelling variations:
viet tach » viet sach, viet tech, viet thanh
hanh hinh » hanh chinh, hanh tinh, hanh dinh
dang cong » dung cong
doi viet » dai viet, hoi viet, oi viet
hinh cua » chinh cua, sinh cua, tinh cua
cua dang » cua cong, cua ban
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: doi viet tach - hanh hinh cua dang cong tac ((toan tap) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi viet tach - hanh hinh cua dang cong tac ((toan tap) OR (toan ban))*.