Perhaps you should try some spelling variations:
hien tach » thien hach, chiet tach, vien bach
hanh tinh » hanh trinh, nhanh tinh, thanh tinh
tinh cua » trinh cua, sinh cua, tinh chat
cua dung » cua dang, cua dong, qua dung
cong dan » huong dan, cong dong, cong tac
cong san » cong tac
cong tan » cong tac, cong thanh, 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: hoc hien tach - hanh tinh cua dung ((((cong dan) OR (cong san))) or (cong tan)) toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tach - hanh tinh cua dung ((((cong dan) OR (cong san))) OR (cong tan)) toan ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien tach - hanh tinh cua dung ((((cong dan) OR (cong san))) or (cong tan)) toan ban".
• Adding a wildcard symbol may retrieve word variants: hoc hien tach - hanh tinh cua dung ((((cong dan) OR (cong san))) or (cong tan)) toan ban*.