Perhaps you should try some spelling variations:
thanh trung » thanh tung
vien thanh » viet thanh, tien thanh, dien thanh
cua thong » cua thuong, cua tong, suat thong
cua khong » hua khong, cua phuong, cua thuong
cong dan » cong san, cong tan, huong dan
dan can » dan chan, dan canh, dan ca
can cau » van cau, ban cau, ca 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 ((dieu hanh) or (vien thanh)) - thanh trung ((cua thong) or (cua khong)) cong dan can cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dieu hanh) OR (vien thanh)) - thanh trung ((cua thong) OR (cua khong)) cong dan can cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((dieu hanh) or (vien thanh)) - thanh trung ((cua thong) or (cua khong)) cong dan can cau*.