Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, chien tranh
thanh trung » thanh tung
thong cong » trong cong, tong cong, thong thong
hien hanh » dieu hanh
trung cua » truong cua, trung tuan, trung cap
cua thong » cua thuong, cua khong, cua tong
cong dan » cong san, cong tan, huong dan
dan chan » dan gian, dan ca, van chat
chan cau » phan cau, can cau, chinh cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien thanh) or (hien hanh)) - thanh trung cua thong cong dan chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (hien hanh)) - thanh trung cua thong cong dan chan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien thanh) or (hien hanh)) - thanh trung cua thong cong dan chan cau*.