Perhaps you should try some spelling variations:
hien khanh » hien nhanh, dien khanh, thien thanh
thanh tung » thanh cong
thong cong » trong cong, tong cong, thong thong
hien hanh » dieu hanh
dan thanh » dang thanh, danh thanh, ban thanh
thanh cac » hanh cac, thanh bac, thanh ca
cong dan » cong san, cong tan, huong dan

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 khanh) or (hien hanh)) - ((thanh trung) OR (thanh tung)) toan thong cong dan thanh cac~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien khanh) OR (hien hanh)) - ((thanh trung) OR (thanh tung)) toan thong cong dan thanh cac.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien khanh) or (hien hanh)) - ((thanh trung) OR (thanh tung)) toan thong cong dan thanh cac".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien khanh) or (hien hanh)) - ((thanh trung) OR (thanh tung)) toan thong cong dan thanh cac*.