Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
thanh trung » thanh tung
tam thuong » tai thuong, tam huong, pham thuong
thien anh » thien danh, tien anh, thien chanh
tam thong » tao thong, nam thong, tac thong
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan

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