Perhaps you should try some spelling variations:
thanh trung » thanh tung
thanh chau » thanh cha, thanh cham, thanh chu
hien xanh » hien nhanh, chieu xanh, hien khanh
hien hanh » dieu hanh
cong dang » cong dong, cong dung, cong danh
trung ca » trung cap, truong ca, trung cua
ca chang » ca chung, co chang, san chang
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 xanh) or (hien hanh)) - thanh trung ca chang ((cong dang) OR (cong dan)) thanh chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien xanh) OR (hien hanh)) - thanh trung ca chang ((cong dang) OR (cong dan)) thanh chau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien xanh) or (hien hanh)) - thanh trung ca chang ((cong dang) OR (cong dan)) thanh chau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien xanh) or (hien hanh)) - thanh trung ca chang ((cong dang) OR (cong dan)) thanh chau*.