Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, chien tranh
thanh tung » thanh cong
hien hanh » dieu hanh
cua thong » cua thuong, cua khong, cua tong
hua khong » hoa khong, cua khong, hoac khong
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

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