Perhaps you should try some spelling variations:
thanh trung » thanh tung
thien hach » thien thanh, hien hanh
hien tach » chiet tach, vien bach, hien hanh
trung cua » truong cua, trung tuan, trung cap
cong cong » cong dong, trong cong, dung cong
cong dan » cong san, cong tan, huong dan
phan cau » phan cac, phan tu, phan lap
phan dau » phan tu, hang dau

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien tach) OR (thien hach)) - thanh trung cua cong cong dan ((phan cau) OR (phan dau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien tach) OR (thien hach)) - thanh trung cua cong cong dan ((phan cau) or (phan dau))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien tach) OR (thien hach)) - thanh trung cua cong cong dan ((phan cau) or (phan dau))*.