Perhaps you should try some spelling variations:
thanh trung » thanh tung
hien nhanh » hien hanh, thien thanh, dien thanh
tien thanh » tien thinh, tran thanh, den thanh
trung tuan » trung thanh, trung tam, tran tuan
tuan thong » toan thong, tran thong, tuan phong
khoan cam » khoa cam, khoan va, phan cam
cong dan » cong tan, huong dan, cong dong
cong san » cong tac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hien nhanh) or (tien thanh)) - thanh trung tuan thong ((cong dan) OR (cong san)) khoan cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hien nhanh) OR (tien thanh)) - thanh trung tuan thong ((cong dan) OR (cong san)) khoan cam.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien nhanh) or (tien thanh)) - thanh trung tuan thong ((cong dan) OR (cong san)) khoan cam".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien nhanh) or (tien thanh)) - thanh trung tuan thong ((cong dan) OR (cong san)) khoan cam*.