Perhaps you should try some spelling variations:
thanh trung » thanh tung
vien nganh » vien thanh
trung tuan » trung thanh, trung tam, tran tuan
tuan thong » toan thong, tran thong, tuan phong
hieu manh » chieu xanh, hieu nganh, dieu hanh
cong dan » cong san, cong tan, cong dong
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 ((hieu manh) or (vien nganh)) - thanh trung tuan thong ((cong dan) OR (huong dan)) chan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (vien nganh)) - thanh trung tuan thong ((cong dan) OR (huong dan)) chan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (vien nganh)) - thanh trung tuan thong ((cong dan) OR (huong dan)) chan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (vien nganh)) - thanh trung tuan thong ((cong dan) OR (huong dan)) chan cau*.