Perhaps you should try some spelling variations:
thanh trung » thanh tung
thien danh » thien anh, thien dang, thien thanh
hien hanh » dieu hanh
trung cua » truong cua, trung tuan, trung cap
nong dan » nong san, nguong dan, huong dan
cong dan » cong san, cong tan, huong dan
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 hanh) or (thien danh)) - thanh trung cua cong ((nong dan) OR (cong dan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien hanh) OR (thien danh)) - thanh trung cua cong ((nong dan) OR (cong dan)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien hanh) or (thien danh)) - thanh trung cua cong ((nong dan) OR (cong dan)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien hanh) or (thien danh)) - thanh trung cua cong ((nong dan) OR (cong dan)) toan cao*.