Perhaps you should try some spelling variations:
hien thanh » thien thanh, hien hanh, dien thanh
tien thanh » tien thinh, tran thanh, den thanh
chinh cua » chinh ca, chinh sua, hinh cua
cua nhung » va nhung
cong tan » cong tac, cong thanh, cong ty
cong san » cong tac
toan cao » toan ban, toan tap

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 thanh) or (tien thanh)) - hanh chinh cua nhung ((cong tan) OR (cong san)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien thanh) OR (tien thanh)) - hanh chinh cua nhung ((cong tan) OR (cong san)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien thanh) or (tien thanh)) - hanh chinh cua nhung ((cong tan) OR (cong san)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien thanh) or (tien thanh)) - hanh chinh cua nhung ((cong tan) OR (cong san)) toan cao*.